133

This number is a composite.

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The sum of the first three squares of semiprimes is itself a semiprime, and this is the first such sum with this property: 133 = 4^2 + 6^2 + 9^2 = 7 * 19. [Post]

Submitted: 2004-10-25 04:22:25; Last Modified: 2009-10-09 23:39:33.