|
| |
|
|
A096861
|
|
Function A062401(x)=phi(sigma(x))=f(x) is iterated. Starting with n, a(n) is the largest term arising in trajectory.
|
|
1
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
EXAMPLE
| 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.
|
|
|
MATHEMATICA
| gf[x_] :=DivisorSigma[1, EulerPhi[x]] itef[x_, len_] :=NestList[fs, x, len] Table[Max[itef[w, 20]], {w, 1, 256}]
|
|
|
CROSSREFS
| Cf. A062401, A062402, A095955, A096859-A096864.
Sequence in context: A100769 A023889 A093783 * A118738 A175067 A051377
Adjacent sequences: A096858 A096859 A096860 * A096862 A096863 A096864
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jul 21 2004
|
| |
|
|
