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%I #6 Mar 30 2012 18:52:40
%S 2,7,11,17,19,23,29,31,41,43,47,53,59,67,71,79,83,89,97,101,103,107,
%T 109,113,127,131,137,139,149,151,163,167,173,179,181,191,197,199,211,
%U 223,227,229,233,239,241,251,257,263,269,271,281,283,293,307,311,317,331
%N Primes p such that (p+1)/2 is not prime.
%C Primes not in A005383. 2 together with A034849.
%C The Ramanujan primes, A104272, are a subsequence.
%t Select[Prime[Range[100]], ! PrimeQ[(#+1)/2] &]
%K nonn
%O 1,1
%A _Juri-Stepan Gerasimov_, Apr 28 2010
%E Entries checked by _R. J. Mathar_, May 01 2010
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