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See A097751 for definition of "mod 4 prime signature".
Row 0 of table described in A097753; terms of A097752 with no prime factor of form 4k+1.
Table of n, a(n) for n=1..59.
Eric Weisstein's World of Mathematics, Pythagorean Triple.
Cf. A097751, A097752, A097753, A097754, A097756.
Sequence in context: A227731 A067947 A053640 * A083854 A003586 A114334
Adjacent sequences: A097752 A097753 A097754 * A097756 A097757 A097758
Ray Chandler, Aug 26 2004
Correct offset. Ray Chandler, Jan 15 2013