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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.
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