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

1,1

Links

Table of n, a(n) for n=1..53.

Example

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.

Sequence in context: A242532 A132606 A054288 * A215144 A352108 A333234

Adjacent sequences: A238242 A238243 A238244 * A238246 A238247 A238248

Keyword

nonn

Author

Colin Barker, Feb 20 2014

Status

approved