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The Number 31

Lance Armstrong, in 2003 (at the age of 31), became the 2nd person ever to win the Tour De France 5 times consecutively, beating the runner-up Jan Ullrich by 61 seconds. Note that 2,5,31,61 and 2003 are all prime numbers.

The Mir Space Station docked with 31 spacecrafts during its history.

Portal 31 is Kentucky's first exhibition coal mine. (Huh?)

The number of moves required in a Tower of Hanoi Puzzle containing 5 discs.

The smallest prime such that replacing each digit d with d copies of the digit d produces a different prime (3331).

Time dilation remained an unproved theory for 31 years after it was first proposed by Einstein.

The speed limit in downtown Trenton, a city in western Tennessee, is 31 miles per hour.

31 letters of the Russian alphabet are pronounceable.

In 1953 the big "31" sign made its debut at all Baskin-Robbins stores, offering customers a different ice cream for every day of the month.

The first US space satellite, Explorer-I, weighed 31 pounds and was launched on Jan 31, 1958. The high power transmitter worked for 31 days. [McCranie]

In Buddhism, there are 31 planes of existence.

The book of Proverbs in the Bible has 31 chapters. This is the largest prime number of chapters for any book of the Bible.