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%I #7 Mar 30 2012 17:30:54
%S 1266767,1520159,2486717,3316619,4144541,4512947,4836779,5389519,
%T 5638379,6218827,6448979,6633457,6771419,6907247,7460149,7462639,
%U 7600597,7739033,7874627,8153567,8291573,9110639,9112319,9121003
%N Class 11- primes.
%D R. K. Guy, Unsolved Problems in Number Theory, A18.
%H M. F. Hasler, <a href="/A081430/b081430.txt">Table of n, a(n) for n=1..1000</a>
%t PrimeFactors[n_Integer] := Flatten[Table[ #[[1]], {1}] & /@ FactorInteger[n]]; f[n_Integer] := Block[{m = n}, If[m == 0, m = 1, While[ IntegerQ[m/2], m /= 2]; While[ IntegerQ[m/3], m /= 3]]; Apply[Times, PrimeFactors[m] - 1]]; ClassMinusNbr[n_] := Length[NestWhileList[f, n, UnsameQ, All]] - 3; Prime[ Select[ Range[300000, 1000000], ClassMinusNbr[ Prime[ # ]] == 1 &]]
%Y Cf. A005113, A056637, A005109, A005110, A005111, A005112, A081424, A081425, A081426, A081427, A081429.
%K nonn
%O 1,1
%A _Robert G. Wilson v_, Mar 20 2003
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