Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #3 Oct 01 2013 17:58:04
%S 5,7,11,139,11,13,449,17,23,83,23,29,331,31,67,53,37,59,41,43,113,53,
%T 509,53,269,59,83,331,67,167,71,173,89,149,83,89,101,223,311,97,101,
%U 283,101,107,113,151,137,131,157,137,127,149,137,271,137,421,197,149,257
%N First occurrence of numbers p such that p = (prime(n)+ prime(n+k))/2 is prime for prime indices n=2, 3, 5... and k=1, 2, ...
%e k=2, prime(2) + prime(2+2) = 10. 10/2 = 5
%e k=3, prime(2) + prime(2+3) = 14. 14/2 = 7
%e k=4, prime(3) + prime(3+4) = 22. 22/2 = 11
%o (PARI)
%K easy,nonn
%O 2,1
%A _Cino Hilliard_, Sep 10 2004