A238245 Positive integers n such that x^2 - 22xy + y^2 + n = 0 has integer solutions.

20, 39, 56, 71, 80, 84, 95, 104, 111, 116, 119, 120, 156, 180, 191, 224, 239, 255, 284, 296, 311, 320, 336, 351, 359, 380, 399, 404, 416, 431, 444, 455, 464, 471, 476, 479, 480, 500, 504, 551, 596, 599, 624, 639, 680, 695, 696, 719, 720, 756, 764, 791, 824

Offset: 1

Author

Colin Barker, Feb 20 2014

Keywords

• nonn

Examples

			39 is in the sequence because x^2 - 22xy + y^2 + 39 = 0 has integer solutions, for example (x, y) = (2, 43).
		

Crossrefs

Cf. A157014 (n = 20), A137881 (n = 104), A077422 (n = 120), A133275 (n = 180).

Cf. A031363, A084917, A237351, A237599, A237606, A237609, A237610, A236330, A236331, A238240.