## Adam Spencer's Book of NumbersHow many people do you need in a room before there'll be a birthday in common? Why is 70 weird, and what can we do about it? How can 56 people eat 1 pizza? In 100 bite-size chapters of no more than three pages each, Adam Spencer gives each number, 1 to 100, its place in the limelight. For example, take 65. It's the constant of a 5 x 5 "magic square" -- a square that contains the numbers 1 to 25, where all the rows and columns and each diagonal add up to 65. Elizabeth Taylor had 65 costume changes in Cleopatra. And sharks can travel up to 65 kilometers per hour (about 40 mph). After reading Adam Spencer's Book of Numbers, readers will never look at numbers the same way again. |

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### Contents

The garden pea French kings again Barbara Bel Geddes | 25 |

Divisibility by 19 nonadekaphobia in Ancient Babylon Go | 31 |

Pentagonal numbers pi catch22 | 38 |

Palindromic squares John Keats and Aubrey | 44 |

Primorials lunar months Lego | 50 |

Crosswords freezing Bart Simpson | 53 |

The magic hexagon the shortest war James Bond | 62 |

Euler again Jane Austen middlechild syndrome Mozart | 68 |

Kaprekar numbers 2200 matchheads | 74 |

Ulam numbers again the Moops Marilyn Monroe 77 | 77 |

Betrothed numbers potatoes piglets | 79 |

SB Sums of squares Baywatch The Love Boat | 82 |

Iodine a calculating genius Africa | 88 |

SB Tetrahedrons ninja knockouts | 93 |

B1 Twin primes Diophantine equations UFO sightings | 99 |

101 | |

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### Common terms and phrases

60 seconds abundant number Agent 99 amazing American Ancient atomic number average balls Batgirl binary numbers birthday Book Brasil bugger called cent centimetres chess comet composite numbers consecutive triangular numbers cube Dad's Army digits Diophantus divided Earth Elvis episode equal equation famous favourite Fawlty Towers Fermat Fibonacci Fibonacci number film Gilligan's Island Gone in 60 googol highly composite infinite number Kaprekar Kaprekar number kings layer leaves a remainder Leonhard Euler longest Louis lucky number Macbeth MacGyver magic square mathematician mathematics Mersenne prime metres minutes moon number is divisible number of primes odd numbers palindromic perfect number pizza can create played prime factors prime number proper divisors QUIZ QUESTION record regular prime sexy Smart Space Shuttle Challenger square number square pyramidal square pyramidal numbers tetrahedral numbers thafs there's triangle TV show untouchable number weird number whole numbers write written York youll