A097270 Numbers that are the difference of two nonzero squares but not the sum of two nonzero squares.

3, 7, 9, 11, 12, 15, 16, 19, 21, 23, 24, 27, 28, 31, 33, 35, 36, 39, 43, 44, 47, 48, 49, 51, 55, 56, 57, 59, 60, 63, 64, 67, 69, 71, 75, 76, 77, 79, 81, 83, 84, 87, 88, 91, 92, 93, 95, 96, 99, 103, 105, 107, 108, 111, 112, 115, 119, 120, 121, 123, 124, 127, 129, 131, 132

Offset

1,1

Comments

Intersection of A024352 (difference of squares) and complement of A000404 (sum of squares).

Links

Table of n, a(n) for n=1..65.

Eric Weisstein's World of Mathematics, Sum of Squares Function.

Crossrefs

Cf. A000404, A024352, A097268-A097271.

Sequence in context: A276492 A023992 A179197 * A109802 A180442 A165631

Adjacent sequences: A097267 A097268 A097269 * A097271 A097272 A097273

Keyword

nonn

Author

Ray Chandler, Aug 19 2004

Status

approved