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Search: id:A130336
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| 1, 2, 7, 10, 13, 22, 31, 37, 58, 79, 82, 95, 109, 118, 157, 178
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n)=A130335(A130337(n)); A130335(k)<a(n) for k<A130337(k).
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MATHEMATICA
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f[n_] := Block[{k = 1}, While[ GCD[n(n + 1)/2, (n + k)(n + k + 1)/2] != 1, k++ ]; k]; t = Table[0, {1000}]; Do[a = f@n; If[a < 1001 && t[[a]] == 0, t[[a]] = n; Print[{a, n}], If[a > 1000, Print[{"Over 1000", n}]]], {n, 2^31 - 1}] (* from Robert G. Wilson v (rgwv(at)rgwv.com), Jun 03 2007 *) - Robert G. Wilson v (rgwv(at)rgwv.com), Jun 03 2007
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CROSSREFS
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Sequence in context: A029904 A026364 A003158 this_sequence A085303 A022886 A047524
Adjacent sequences: A130333 A130334 A130335 this_sequence A130337 A130338 A130339
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KEYWORD
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nonn,more
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 28 2007
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EXTENSIONS
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a(13)-a(16) from Robert G. Wilson v (rgwv(at)rgwv.com), Jun 03 2007
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