Numbers 2019
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NUMBERFASCINATING FACTSAVAILABLE
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i = √(-1)It is the 'imaginary unit' and without it we wouldn't have the technology we have today.
e^{i*pi }+1=0 is described as the most beautiful equation in the world.
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00 is neither positive or negative. Absolute zero at -273.15°C is really cool! Available
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1In English , there is ONE word with ONE vowel which occurs 6 times: indivisibility.Sold
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Φ ≈ 1.6180339887...The Golden Number - the only positive number whose square is one greater than itself. Found in nature, architecture, the human body, art, beauty and, of course, in maths.Sold
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2It's odd that 2 is the only even prime number.Sold
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e ≈ 2.7182818284...Euler named e in the 1700s but John Napier had discovered it as the base for natural logarithms in 1614; he is also well known for Napier's Bones, used for multiplication.
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3Three is the only number that is the sum of the preceding integers 3=1+2. The sum of the digits of every number divisible by 3 is a multiple of 3. <3 means I love you. There are 3 kinds of people: those who can count and those who can't.Sold
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∏ ≈ 3.141592653589..Albert Einstein was born on Pi Day (March 14th). The Pi Search page tells you how many times your birthday (eg 30012019) occurs in the first 200m digits.Sold
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4Four is the only number with its own number of letters. Can you read this...STA4NCE?
Four is is the smallest number of colours sufficient to colour a map with no adjoining countries sharing the same colour.
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5Five is a prime number and can be seen as both an unlucky and a lucky number.
In the words SUBCONTINENTAL and UNORIENTAL the five vowels appear in reverse alphabetical order.
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6The first perfect number (if you add all its factors other than itself - 1, 2 and 3 in this case - you get the number). Six degrees of separation is the idea that everyone in the world is six or fewer steps away from each other by "a friend of a friend" chain.Sold
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7The only single digit number that requires two syllables. The word 'letters' contains seven letters and is called 'self-referential'.Sold
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8The luckiest number in Chinese culture. With pronunciation of 'Ba' in Chinese, no. 8 sounds similar to the word 'Fa', which means to make a fortune. It contains meanings of prosperity, success and high social status too, so all business people favour it very much.Available
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9Nine is the highest single digit. The sum of the digits of every number divisible by 9 is a multiple of 9.Sold
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10The roman numeral for 10 is X which looks like two V's put together (the roman numeral for 5).Available
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11Eleven plus two' is the anagram of 'twelve plus one'.
Aibohphobia is a fictional term for the fear of palindromes, which is a palindrome itself and contains 11 letters.
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12Two + eleven = twoeleven, twOelEveN - ONE = twelve.Sold
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13There are approximately 13 cycles of the moon each year. There are 13 cards in each suit in a standard deck of playing cards. thirteen is known to be the unlucky number. A fear of Friday 13th is called Paraskavedekatriaphobia.Sold
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14Fourteen pounds in a stone The French expression: "chercher midi à quatorze heures" (to look for noon at 14:00 - i.e. 2 pm) is a way of telling someone that they are making an issue more difficult than it needs to be - turning something simple into something complicated.Sold
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15The number 15 in angel numerology marks the manifestion of a harminous life.
The only 15-letter word that can be spelled without repeating a letter is "uncopyrightable".
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16The element with atomic number 16 is Sulphur or Sulfur, also known as 'brimstone'. Sulfur compounds are why onions make you cry. It is the tenth most abundant element in the universe.Sold
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17On July 17 in 1717, Handel's Water Music was first performed. There are seventeen 17s in the first thousand digits of pi.Available
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18The 18-letter words 'conservationalists' and 'conversationalists' are anagrams of each other. They are the longest pair of anagrams with such properties.Sold
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19Number 19 in acient times was known as the "Number of Surrender".Available
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20Calcium, with atomic number 20, is the most abundant metallic element in our bodies, with around a kg in our bones and teeth.Sold
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21The number of spots on a die is 21.
A twenty-one gun salute is fired for royalty because it dates back to when the largest ships had 21 guns on each side.
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22The 22 is the most powerful of all numbers, able to turn lofty dreams into realities. It is confident, pragmatic, ambitious and disciplined. It is the smallest number which can be expressed as the sum of 2 primes in 3 ways: 3 + 19, 5 + 17, and 11 + 11.Sold
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23Each parent contributes 23 chromosomes to the start of human life. The 'Birthday Paradox' states that a group of 23 randomly-selected persons is the lowest number where there will be a probability higher than 50 per cent that two people will share the same birthday.Sold
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24It is the smallest number with exactly eight divisors: 1, 2, 3, 4, 6, 8, 12, 24.Available
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2525 is a square, and can be made from adding two other squares: 3^2 + 4^2 = 5^2, which is the smallest Pythagorean Triple.Sold
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2626 is the only number sandwiched between a square (25) and a cube (27) A rhombicuboctahedron has twenty-six faces.Available
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27There are exactly 27 straight lines on a smooth cubic surface.
The number of letters in the Spanish alphabet is 27.
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28Twenty eight is the second perfect number.
It is also the number of days (for most of the time) in the shortest month of the Gregorian calendar, February.
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29Twenty nine is the sum of three consecutive squares 2² + 3² + 4².Available
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30A polygon with 30 sides is a triacontagon.Available
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31Thirty one is a lucky number .
31 years is roughly a billion seconds.
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3232 is a full set of adult teeth, including wisdom teeth.
32° Fahrenheit is the melting point of ice.
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33There are 33 vertebrae in human spine.
33 is the largest positive integer that cannot be expressed as a sum of different triangular numbers.
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3434 is the tenth number in the Fibonacci Sequence. There were 34 States in the US at the start of the American Civil War.
The rows and columns of a 4×4 magic square total 34.
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3535 is a tetrahedral number, meaning it is the sum of the first 5 triangluar numbers (1 + 3 + 6 + 10 = 35).Available
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3636 is the smallest square triangular number other than 1,
and is the number of possible outcomes in the roll of two dice.
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37If you ask someone to think of any number from 1 to 50,
one people out of three answers 37 - it is a 'psychologically random number'.
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38 38 is the sum of the squares of the first three prime numbers. Available
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39= 3 x 13
= 3 + 5 + 7 + 11 + 13 
(sum of a sequence of consecutive primes and product of the first and last primes in that sequence).
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40Forty is the only number whose letters appear in alphabetical order.Available
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41Forty one is the lowest number whose cube is the sum of three cube numbers in two different ways:
413 = 23 + 173 + 403 = 63 + 323 + 333 = 68,921.
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42The answer to life, the universe and everything.Available
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4343 is a centered heptagonal number.
You require 43 muscles to frown.
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4444 is the number of derangements of 5 objects, or said in another manner, the number of different ways in which 5 people with 5 hats can each take the wrong hat...Available
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45The sum of all single digit numbers is forty five: 0+1+2+3+4+5+6+7+8+9=45.Available
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46Human beings have 46 chromosomes in every cell of their body.Available
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47There are 47 occurrences of '47' in the first thousand prime numbers.Available
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4848 is a Harshad number in base 10 In Chinese Numerology.
48 is an auspicious number meaning 'determined to prosper'.
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4949 is a perfect square, it is the smallest number which is the concatenation of two prime squares (2 squared and 3 squared) creating another prime square (7 squared).Available
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50The number of letters in "fifty" equals the sum of the digits in 50.Available
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5151 is the smallest number which can be written with all the digits from 1 to 5 (without repetition) as a sum of prime numbers:
2 + 3 + 5 + 41.
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5252 is the number of cards in a standard pack without jockers, the number of weeks in a year
and the number of white keys on a piano.
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53Fifty three is the smallest prime which is not the difference between powers of 2 and 3.
53 is the atomic number of iodine.
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5454 is the smallest number that can be written as the sum of 3 squares in 3 different ways:
72 + 22 + 12 = 62 + 32 + 32 = 52 + 52 + 22.
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5555 is the largest triangular number in the Fibonacci sequence.Available
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56The '56 Aubrey Holes' are one of the oldest features of Stonehenge. They are 56 holes arranged in a circle,
but their purpose is still unknown.
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5757 is the number of sauce varieties H. Heinz lied about to promote his famous ketchup (when he began his business, he actually had many fewer than 57 sauces or food products!).Available
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58Is the sum of the first seven prime numbers.
58% of people think Sherlock Holmes is real.
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591 day on Mercury is 59 Earth days.
59 is also the number of beads on a Roman Catholic rosary.
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60The cycle of 60 in the Chinese zodiac (六十花甲; liùshí huājiǎ) is formed by the 5 Elements and 12 terrestrial Branches (Animals).Available
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6161 is a prime, a twin prime and a cuban prime number.
Code 61 will allow you to call Australia from another country.
61 is the number of points required to win a game of cribbage.
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62The rhombicosidodecahedron has 62 sides.
There are 62 moons orbiting Jupiter.
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63The smallest whole number that can be divided by any number from 1 - 9 without any recurring decimals is sixty three.Available
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6464 is an even composite number. It is composed of a single prime number multiplied by itself five times.Available
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65The protein in egg whites coagulates at 65 degrees C (150 degrees F).
65 is the length of the hypotenuse of 4 different Pythagorean triangles.
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6666 is the largest number <100 that contains no letter 'e' (sixty-six).Available
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67With just 12 cuts it is possible to divide a pizza into 67 tiny pieces.Available
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68The last day of November 46 B.C. was the longest day in history, it lasted 68 days.Available
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69Together, 69^2 (4761) and 69^3 (328509) use up all digits between 1 and 9.Available
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7070 litres of water are needed to produce one apple.
A 70th wedding anniversary is called Platinum.
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71Is the first of a pair of twin primes: 71, 73.
Twin primes, such as 3 and 5, are primes that differ by 2 (i.e. the smallest possible difference between two primes).
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72The isosceles triangle having a pair of 72° angles is called a Golden Triangle.Available
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7373 is a sexy prime as well as a twin prime
(prime numbers that differ from each other by six are "sexy": 79, also a prime, minus 73 is 6.)
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74If you add up all the letters in all the months of the year, then you will get 74.Available
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75A dollar bill contains 75% cotton and 25% linen.
New Zealand has 4.794 million people making it the world's 75th largest country by population.
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76The Bennington flag features the number 76. This flag is symbolic of when the American colonies were in a state of rebellion against Great Britain. The 76 recalls the year 1776 when the Declaration of Independence was signed.Available
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77Seventy-seven is the smallest number requiring five syllables in English.Sold
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7878 is a triangular number (sum of consecutive integers from 1 to 12):
78 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12.
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7979 = (7*9) +(7+9)Available
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80Spring begins on March 21st, the 80th day of the year.Available
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81 81 is the square of the sum of its digits.
81 is a metonym. It stands for the 8th letter of the alphabet which is an H,
and the 1st letter of the alphabet which is an A, HA = Hells Angels.
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8282 is the number of different ways you can arrange 6 regular hexagons by joining their adjacent sides.Available
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83Eighty three is the number of zeroless squares that are composed of the digits 1 up to 9.Available
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84Uranus revolves around the Sun once every 84 Earth years.Available
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8585 is the smallest number which can be expressed as a sum of two different squares greater than 1 in two ways:
9 squared + 2 squared =7 squared + 6 squared = 85.
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86There are 86 metals on the modern periodic table.Available
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87By tradition, 87 is an unlucky score for cricketers (100-13).Available
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88No. 88 has long been regarded as the luckiest numberin Chinese culture. With pronunciation of 'Ba' inChinese, no. 8 sounds similar to the word 'Fa', which means to make a fortune. It contains meanings of prosperity, success and high social status too, so all business people favour it very much. Eighty eight means double fortune.Available
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8989 generates a cyclic number series where each term is the sum of the square digits of the previous number.
The transfer fee for Paul Pogba to Man United was £89 million.
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9089 - 145 - 42 - 20 - 4 - 16 - 37 - 58 - 89 - ...Available
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9191 is the smallest pseudoprime in base 3.
The longest recorded marriage is 91 years 12 days.
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92The Guinness record of the longest placename,
Taumatawhakatangihangakoauauotamateaurehaeaturipukakapikimaungahoronukupokaiwhenuakitanatahu,
has 92 characters.
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93With just 9 straight cuts a potato can be divided into 93 pieces.Available
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9494 is used as a nonsense number in various contexts by the British satire magazine Private Eye. Most commonly, spoof articles end halfway through an intriguing sentence with "(continued p. 94)". The magazine never extends to 94 pages: this was originally a reference to the enormous size of some Sunday newspapers.Available
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