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A135658
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Nonprimes of the form 4x^2-4xy+7y^2.
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0
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4, 15, 16, 24, 28, 36, 40, 55, 60, 63, 64, 87, 88, 96, 100, 112, 124, 132, 135, 144, 159, 160, 168, 175, 196, 216, 220, 231, 232, 240, 247
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OFFSET
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1,1
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COMMENTS
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Because 4x^2-4*x*y+7*y^2 = (2*x-y)^2+6*y^2, this is a subsequence of A002481. - R. J. Mathar, Jan 18 2021
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LINKS
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MATHEMATICA
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Do[Do[w = 4x^2 - 4x y + 7y^2; If[w > 0, If[PrimeQ[w], [null], AppendTo[a, w]]], {x, 0, 100}], {y, 0, 100}]; Union[a]
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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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