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Search: id:A135658
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| A135658 |
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Nonprimes of the form 4x^2-4xy+7y^2. |
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+0
1
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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
(list; graph; listen)
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OFFSET
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1,1
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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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Cf. A107006, A124477, A135657.
Sequence in context: A076349 A152442 A161769 this_sequence A066862 A103540 A065159
Adjacent sequences: A135655 A135656 A135657 this_sequence A135659 A135660 A135661
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Nov 25 2007
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