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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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re: solution | Comment 2 of 4 |
(In reply to solution by xdog)

Quite nice.  

Should you have: "the second factor is always > 6"?  
Otherwise it could be the one to reduce to 1.

  Posted by Jer on 2017-01-13 16:41:35
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