A077093 Smallest initial values leading to fixed points listed in A077092.

1, 4, 24, 7530, 12100, 32784, 34950, 69480, 121104, 420096

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Example

n=12100: FixedPointList={12100,24000,34944},end=34944; n=121104: FixedPointList={121104,268560}, end=268560.

Mathematica

f[x_] := EulerPhi[DivisorSigma[1, x]-EulerPhi[x]] Do[s=NestList[f, n, 100]; s1=Part[s, 99]; s2=Part[s, 100]; If[Equal[s1, s2]&&!PrimeQ[n], Print[{n, s1}]], {n, 1, 1000}] (*n=site if fixed point appears; s1=fixed point*)

Crossrefs

Cf. A077090-A077100.

Sequence in context: A065711 A279240 A279110 * A077092 A092435 A058230

Adjacent sequences: A077090 A077091 A077092 * A077094 A077095 A077096

Keyword

nonn

Author

Labos Elemer, Oct 31 2002

Status

approved