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Search: id:A096861
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| A096861 |
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Function A062401(x)=phi(sigma(x))=f(x) is iterated. Starting with n, a(n) is the largest term arising in trajectory. |
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+0
2
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| 1, 2, 3, 6, 5, 6, 7, 8, 12, 10, 11, 12, 13, 14, 15, 30, 17, 30, 19, 20, 30, 22, 23, 30, 30, 26, 30, 30, 29, 30, 31, 96, 33, 34, 35, 96, 37, 38, 39, 40, 41, 96, 43, 44, 45, 46, 47, 60, 96, 60, 51, 96, 53, 96, 55, 96, 96, 58, 59, 60, 61, 96, 63, 126, 65, 66, 96, 96, 96, 70, 71, 96
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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n=255: list={255,144,360,288,[432,480],432,.}, a[255]=480,a recurrent term;
n=247: list={247,96,72,96,..}, a[247]=247, a transient term, here the initial value.
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MATHEMATICA
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gf[x_] :=DivisorSigma[1, EulerPhi[x]] itef[x_, len_] :=NestList[fs, x, len] Table[Max[itef[w, 20]], {w, 1, 256}]
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CROSSREFS
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Cf. A062401, A062402, A095955, A096859-A096864.
Sequence in context: A100769 A023889 A093783 this_sequence A118738 A051377 A057723
Adjacent sequences: A096858 A096859 A096860 this_sequence A096862 A096863 A096864
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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), Jul 21 2004
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