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A020678
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Numbers of form 3 x^2 + 5 y^2.
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1
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0, 3, 5, 8, 12, 17, 20, 23, 27, 32, 45, 47, 48, 53, 57, 68, 72, 75, 80, 83, 92, 93, 95, 107, 108, 113, 120, 125, 128, 137, 147, 152, 153, 155, 167, 173, 180, 183, 188, 192, 197, 200, 207, 212, 227, 228, 233, 237, 243, 245, 248, 255, 257, 263, 272, 288, 293, 300, 305, 317
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OFFSET
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1,2
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COMMENTS
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Discriminant -60.
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LINKS
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MATHEMATICA
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With[{upto=320}, Select[Union[3#[[1]]^2+5#[[2]]^2&/@ Tuples[ Range[ 0, Ceiling[ Sqrt[upto]]], 2]], #<+upto&]] (* Harvey P. Dale, May 22 2015 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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