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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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10
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| 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
| Cf. A000010, A000203, A095952, A096887, A095953, A096526, A095954, A096889, A096890, A095955, A095956.
Sequence in context: A135209 A091294 A096518 * A049026 A187424 A186216
Adjacent sequences: A096885 A096886 A096887 * A096889 A096890 A096891
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu) and Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 14 2004
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