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A238245
Positive integers n such that x^2 - 22xy + y^2 + n = 0 has integer solutions.
1
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
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).
Sequence in context: A242532 A132606 A054288 * A215144 A352108 A333234
KEYWORD
nonn
AUTHOR
Colin Barker, Feb 20 2014
STATUS
approved