P is a positive integer such that each of 2P + 1 and 3P + 1 is a perfect square.

Prove that P is divisible by 40

(In reply to re: Two values, no proof - Sloane sequence by Brian Smith)

I was going to write a program using QuickBasic or UBasic since the exercise as becoming unwieldy in Excel but with Praneeth's post there was clearly no point in going there to try to get some sense of reason for the sequence.

Thanks for that.

Posted by brianjn on 2008-05-15 05:03:03