Search: id:A079151
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%I A079151
%S A079151 2,3,5,7,11,13,19,23,29,31,43,47,53,59,67,71,79,83,103,107,131,139,149,
%T A079151 167,173,179,191,223,227,239,263,269,283,293,311,317,347,359,367,383,
%U A079151 389,419,431,439,443,467,479,499,503,509,557,563,587,599,607,619,643
%N A079151 Primes p such that p-1 has at most 3 prime factors, counted with multiplicity; 
               i.e. primes p such that bigomega(p+1) = A001222(p+1) <= 3.
%e A079151 149 is in the sequence because 149-1 = 2*2*37 has 3 prime factors.
%o A079151 (PARI) s(n) = {sr=0; ct=0; forprime(x=2,n, if(bigomega(x-1) < 4, print1(x" 
               "); sr+=1.0/x; ct+=1; ); ); print(); print(ct" "sr); } \\ Lists primes 
               p<=n such that p-1 has at most 3 prime factors.
%Y A079151 Cf. A079148, A079150, A079152, A079153.
%Y A079151 Sequence in context: A007459 A129944 A152900 this_sequence A005728 A049643 
               A050437
%Y A079151 Adjacent sequences: A079148 A079149 A079150 this_sequence A079152 A079153 
               A079154
%K A079151 easy,nonn
%O A079151 1,1
%A A079151 Cino Hilliard (hillcino368(AT)gmail.com), Dec 27 2002

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