21357Re: F = 20z^2 - n and (5r^2 -F)/n
- Mar 2, 2010--- In firstname.lastname@example.org,
"djbroadhurst" <d.broadhurst@...> wrote:
> Puzzle: (p^2 + 11)/20 is a square for the primesKevin sent me a correct answer, in decimal format. But for
> p = 3, 13, 67, 4253, 21587, 6950947 ...
> Find the 17th prime in this sequence.
that he needed 454 characters. The solution can be written
in less than 20 characters, using a form that OpenPFGW
readily understands. So the puzzle is still open, for a
Meanwhile, congratulations to Kevin, for a valid result
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