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A242664
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Nonnegative integers of the form x^2 + 6xy - y^2.
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2
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0, 1, 4, 6, 9, 10, 15, 16, 24, 25, 26, 31, 36, 39, 40, 41, 49, 54, 60, 64, 65, 71, 74, 79, 81, 86, 89, 90, 96, 100, 104, 106, 111, 121, 124, 129, 134, 135, 144, 150, 151, 156, 159, 160, 164, 166, 169, 185, 186, 191, 196, 199, 201, 214, 215, 216, 225, 234, 239, 240, 241, 246, 249, 250, 256, 260, 265, 271, 279, 281, 284, 289, 294, 296
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OFFSET
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1,3
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COMMENTS
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Discriminant 40.
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LINKS
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MATHEMATICA
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Reap[For[n = 0, n <= 300, n++, If[Reduce[ x^2 + 6*x*y - 1*y^2 == n, {x, y}, Integers] =!= False, Sow[n]]]][[2, 1]]
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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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