login
A077093
Smallest initial values leading to fixed points listed in A077092.
0
1, 4, 24, 7530, 12100, 32784, 34950, 69480, 121104, 420096
OFFSET
1,2
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
KEYWORD
nonn
AUTHOR
Labos Elemer, Oct 31 2002
STATUS
approved