61

This number is a prime.

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The least prime such that its square can be expressed as the sum of one, two, three, or four distinct squares: 612 = 602 + 112 = 522 + 242 + 212 = 562 + 222 + 102 + 12. [Rupinski]

Submitted: 2002-12-10 14:59:24;   Last Modified: 2008-01-30 11:28:00.
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