Interesting Facts about the Number 31?

The number is a entered triangular, pentagonal and decagonal number. In ice hockey the goal tenders usually wear the number thirty one. It is also the atomic number of Gallium.
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 31 is a prime number. = 2 + 2 + 2 + 2 + 2. The sum of five powers of 2. = 5 + 5 + 5. The sum of three powers of 5. = 2 - 1. A Mersenne prime. There are 31 letters in the Cyrillic http://wiki.answers.com/Q/What_are_facts_about_the...
 There aren't really many, but one, if anything, is that 31 is the http://www.chacha.com/question/what-are-some-cool-...
 Sixteen is a composite number, and a square number, being 42 = 4 × 4. It is the tiniest number with exactly five divisors, its proper divisors being 1, 2, 4 and 8. It is the http://answers.yahoo.com/question/index?qid=200611...
 I guess the most common fact about prime numbers is that they can only be divided by themselves and one, leaving no remainder. Note that 1 is not regarded as a prime number. Other http://uk.answers.yahoo.com/question/index?qid=201...
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