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A020672
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Numbers of form x^2 + 9 y^2.
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3
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0, 1, 4, 9, 10, 13, 16, 18, 25, 34, 36, 37, 40, 45, 49, 52, 58, 61, 64, 72, 73, 81, 82, 85, 90, 97, 100, 106, 109, 117, 121, 130, 136, 144, 145, 148, 153, 157, 160, 162, 169, 178, 180, 181, 193, 196, 202, 205, 208, 225, 226, 229, 232, 234, 241, 244, 250, 256, 261, 265, 274
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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lim=300; k=9; Union@Flatten@Table[x^2 + k y^2, {y, 0, Sqrt[lim/k]}, {x, 0, Sqrt[lim-k y^2]}] (* Vincenzo Librandi, Aug 31 2016 *)
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PROG
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(Magma) [n: n in [0..300] | NormEquation(9, n) eq true]; // Vincenzo Librandi, Aug 31 2016
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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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