A261522 - OEIS

A261522

Positive integers k such that x^2 - 23xy + y^2 + k = 0 has integer solutions.

21, 41, 59, 75, 84, 89, 101, 111, 119, 125, 129, 131, 164, 189, 201, 236, 251, 269, 300, 311, 329, 336, 356, 369, 381, 404, 419, 425, 444, 461, 476, 479, 489, 500, 509, 516, 521, 524, 525, 531, 579, 581, 629, 656, 675, 719, 731, 756, 761, 801, 804, 831, 839

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

OFFSET

1,1

LINKS

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

EXAMPLE

41 is in the sequence because x^2 - 23xy + y^2 + 41 = 0 has integer solutions; for example, (x, y) = (2, 45).

CROSSREFS

Cf. A004253, A237254.

Cf. A031363, A084917, A237351, A237599, A237606, A237609, A237610, A236330, A236331, A238240, A238245.

Sequence in context: A070666 A320775 A104393 * A215145 A154576 A173960

Adjacent sequences: A261519 A261520 A261521 * A261523 A261524 A261525

KEYWORD

nonn

AUTHOR

Colin Barker, Aug 23 2015

STATUS

approved