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A372518
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Positive numbers primitively represented by the indefinite quadratic form x^2 + 13xy - 9y^2.
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2
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1, 5, 21, 39, 51, 59, 81, 91, 105, 119, 131, 139, 141, 159, 189, 195, 201, 221, 241, 255, 269, 271, 279, 291, 295, 329, 351, 359, 369, 371, 405, 409, 411, 441, 455, 459, 469, 471, 501, 541, 549, 569, 579, 595, 599, 611, 651, 655, 661, 679, 681, 689, 695, 699
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OFFSET
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1,2
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COMMENTS
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Discriminant 205.
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LINKS
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PROG
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(SageMath)
load('https://raw.githubusercontent.com/PeterLuschny/BinaryQuadraticForms/main/BinaryQF.sage')
Q = binaryQF([1, 13, -9])
print(Q.represented_positives(700, 'primitively'))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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