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**Stranger** on
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How many positive integers n≤1000 cannot be written in the form a2−b2−c2 where a,b and c are non-negative integers subject to a≥b+c?

Tuesday

March 28, 2017
Posted by
**Stranger** on
.

How many positive integers n≤1000 cannot be written in the form a2−b2−c2 where a,b and c are non-negative integers subject to a≥b+c?

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