17

This number is a prime.

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17 is the smallest prime of form x^2 + y^2 + z, where x, y and z are three successive positive integers (2^2 + 3^2 + 4 = 17). [Teofilatto]

Submitted: 2004-10-04 14:18:38; Last Modified: 2008-01-30 17:28:00.