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A261522
Positive integers k such that x^2 - 23xy + y^2 + k = 0 has integer solutions.
0
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
OFFSET
1,1
EXAMPLE
41 is in the sequence because x^2 - 23xy + y^2 + 41 = 0 has integer solutions; for example, (x, y) = (2, 45).
KEYWORD
nonn
AUTHOR
Colin Barker, Aug 23 2015
STATUS
approved