## tenThe base of our familiar number system, which stems directly from the fact that we have ten fingers on which to count. Ten is the only triangular number that is a sum of consecutive odd squares (10 = 1 ^{2}
+ 3^{2}) and the only composite integer such that all of its positive
integer divisors other than 1 are of the form x^{2} + 1 (2
= 1^{2} + 1, 5 = 2^{2} + 1, 10 = 3^{2} + 1). Strange
but true: the lifespan of a taste bud is ten days. ## Related category• NOTABLE NUMBERS | |||||

Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact |