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A207638
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Squares that can be written as a sum of 3 distinct non-zero squares in no more than one way.
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2
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49, 81, 121, 169, 196, 289, 324, 484, 676, 784, 1156, 1296, 1936, 2704, 3136, 4624, 5184, 7744, 10816, 12544, 18496, 20736, 30976, 43264, 50176, 73984, 82944, 123904
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..28.
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MATHEMATICA
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t = Sort[Select[Flatten[Table[x^2 + y^2 + z^2, {x, 400}, {y, x + 1, 400}, {z, y + 1, 400}]], # < 160006 && IntegerQ[Sqrt[#]] &]];
f1[l_] := Module[{t = {}}, Do[If[l[[n]] != l[[n + 1]] && l[[n]] != l[[n - 1]], AppendTo[t, l[[n]]]], {n, Length[l] - 1}]; t];
s1 = Join[{First[t]}, f1[t]]
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CROSSREFS
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Sequence in context: A103216 A036307 A056938 * A106311 A006832 A093894
Adjacent sequences: A207635 A207636 A207637 * A207639 A207640 A207641
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KEYWORD
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nonn
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AUTHOR
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Vladimir Joseph Stephan Orlovsky, Feb 19 2012
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STATUS
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approved
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