perplexus.info :: Just Math : 1+4=5

1+4=5 (Posted on 2016-03-28)

The sum of the squares of the first n positive integers is always a composite number, except the case of n=2.

Prove it.

See The Solution Submitted by Ady TZIDON

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a trivial disclaimer

| Comment 1 of 2

Actually "is never a prime number, except the case of n=2" would be a better definition, since 1 is neither prime nor composite.

Posted by Ady TZIDON on 2016-03-28 08:54:32

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