A096991 - OEIS

%I #3 Oct 15 2013 22:32:33

%S 401,451,489,491,505,513,567,577,629,631,652,661,673,679,685,691,713,

%T 731,737,751,757,769,773,791,802,808,811,817,825,829,833,847,851,853,

%U 859,867,869,871,873,877,889,893,899,901,902,907,911,917,919,923,931

%N Initial values for f(x)=sigma(phi[x])=A062402[x] such that iteration of f ends in cycle of length=4.

%Y Cf. A062402, A096926.

%K nonn

%O 1,1

%A _Labos Elemer_, Jul 19 2004