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Search: id:A096888
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| A096888 |
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Initial values for f(x)=phi(sigma(x)) such that iteration of f ends in cycle of length=11. |
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11
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| 76050, 88452, 88896, 95922, 104364, 104988, 106032, 108252, 110450, 110928, 112896, 113052, 113412, 113868, 115572, 119892, 119916, 121680, 122220, 122832, 122916, 123060, 123312, 129600, 129840, 129984, 130260, 130560, 131280, 133860
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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g[n_] := EulerPhi[ DivisorSigma[1, n]]; f[n_] := f[n] = Block[{lst = NestWhileList[g, n, UnsameQ, All ]}, -Subtract @@ Flatten[ Position[lst, lst[[ -1]]]]]; Select[ Range[134000], f[ # ] == 11 &]
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CROSSREFS
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Cf. A000010, A000203, A095952, A096887, A095953, A096526, A095954, A096889, A096890, A095955, A095956.
Sequence in context: A135209 A091294 A096518 this_sequence A049026 A104327 A046720
Adjacent sequences: A096885 A096886 A096887 this_sequence A096889 A096890 A096891
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu) and Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 14 2004
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