5

This number is a prime.

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Pollock's conjecture (1850) states that every number can be written as the sum of at most five tetrahedral numbers. No connection with the famous painting No. 5, 1948, by Jackson Pollock. [Capelle]

Submitted: 2009-08-12 06:22:32; Last Modified: 2009-08-12 21:46:46.