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Squares sum up to a prime (Posted on 2017-01-13) Difficulty: 3 of 5
List all integers n such that the sum 2^2 + 3^2 + 4^2 + ... + n^2 equals a prime number. p&p solutions only.

See The Solution Submitted by Ady TZIDON    
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response to comments Comment 4 of 4 |
Should you have: "the second factor is always > 6"?  
I meant 'the reduced second factor' but your text is clearer.

be coherent with  defining  (n-1)/6  as the 1st factor
I mentioned reducing the first factor and explicitly showed division by factors of 6.


  Posted by xdog on 2017-01-14 07:50:35
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