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Smallest initial values leading to fixed points listed in A077092.
0

%I #6 Oct 15 2013 22:31:37

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

%N Smallest initial values leading to fixed points listed in A077092.

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

%t 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*)

%Y Cf. A077090-A077100.

%K nonn

%O 1,2

%A _Labos Elemer_, Oct 31 2002