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Search: id:A108783
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| 0, 2, 6, 10, 12, 26, 30, 32, 36, 50, 52, 56, 60, 62, 126, 130, 132, 136, 150, 152, 160, 164, 166, 170, 172, 174, 176, 180, 184, 192, 194, 198, 200, 202, 214, 216, 220, 226, 228, 230, 234, 236, 240, 242, 244, 260, 262, 264, 272, 274, 278, 282, 286
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Robert G. Wilson v, Table of n, a(n) for n = 1..1356
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MATHEMATICA
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a[n_] := a[n] = Block[{s = Sum[a[i]*x^i, {i, 0, n - 1}]}, If[ IntegerQ@ Last@ CoefficientList[ Series[ Sqrt[s + x^n], {x, 0, n}], x], 1, 2]]; Union@ Table[ If[ a[n] == 1, n, 0], {n, 0, 300}] (* from Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 25 2006 *)
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CROSSREFS
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Cf. A083952, A108337, A108338. See A111363 for another version.
Sequence in context: A071638 A028348 A140776 this_sequence A066679 A086123 A144031
Adjacent sequences: A108780 A108781 A108782 this_sequence A108784 A108785 A108786
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), following a suggestion from Paul Hanna, Jun 30 2005
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