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%I
%S 31,43,61,67,71,79,103,127,131,139,151,157,181,191,199,223,229,239,
%T 241,271,277,281,283,307,311,313,337,349,367,373,379,397,409,419,431,
%U 439,443,457,461,491,499,521,523,541,599,601,607,613,617,619,643,647,659
%N primes p such there are 3 distinct prime factors in p-1.
%K nonn
%O 1,1
%A _Benoit Cloitre_, Feb 23 2002
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