[seqfan] Re: How to generate A000047?

T. D. Noe noe at sspectra.com
Mon Jan 19 19:43:40 CET 2009

See A035251. It says "n is representable in the form x^2-2y^2 iff every
prime p == 3 or 5 mod 8 dividing n occurs to an even power."

Much faster than Mma.


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