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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 6 04:14 EST 2023. Contains 360094 sequences. (Running on oeis4.)