Posted by Stranger on Monday, March 18, 2013 at 3:57am.
How many positive integers n≤1000 cannot be written in the form a2−b2−c2 where a,b and c are nonnegative integers subject to a≥b+c?

Algebra  Saurabh D, Friday, March 22, 2013 at 2:15pm
0.

Algebra  Krishna, Tuesday, July 9, 2013 at 10:59am
the ans is 0
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