Search: id:A067774
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%I A067774
%S A067774 2,7,13,19,23,31,37,43,47,53,61,67,73,79,83,89,97,103,109,113,127,131,
%T A067774 139,151,157,163,167,173,181,193,199,211,223,229,233,241,251,257,263,
%U A067774 271,277,283,293,307,313,317,331,337,349,353,359,367,373,379,383,389
%N A067774 Primes p such that p+2 is not a prime.
%C A067774 Primes n such that n!*B(n+1) is an integer where B(k) are the Bernoulli 
               numbers.
%C A067774 All primes except for the lower members of twin primes - i.e. remove 
               3, 5, 11, 17, 29, 41, 59, 71, 101, 107, 137, ... - Gerard Schildberger 
               (gerards(AT)rrt.net), Feb 13 2005
%F A067774 Except for a(1)=2, a(n+1)=A049591(n)
%t A067774 f[n_]:=PrimeQ[n+2]; lst={};Do[p=Prime[n];If[ !f[p],AppendTo[lst,p]],{n,
               5!}];lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 17 
               2009]
%Y A067774 Cf. A049591.
%Y A067774 Complement of A001359 in A000040, A025584, A007510.
%Y A067774 Sequence in context: A155547 A007821 A156007 this_sequence A063637 A020623 
               A109346
%Y A067774 Adjacent sequences: A067771 A067772 A067773 this_sequence A067775 A067776 
               A067777
%K A067774 nonn
%O A067774 1,1
%A A067774 Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 06 2002
%E A067774 Better description from Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 14 
               2002

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