%I A104294
%S A104294 3,5,7,13,17,23,29,37,47,53,67,73,79,89,103,113,127,139,151,157,173,181,
%T A104294 197,227,233,239,251,257,269,311,317,347,349,379,383,401,421,433,449,
%U A104294 463,467,503,509,523,541,577,613,619,631
%N A104294 p[(p[n]+1)/2], p[n] is n-th prime.
%C A104294 n=1 is a degenerate case because p[1]=2, (p[n]+1)/2=3/2 and there is 
               no p[3/2]. p[(p[n]-1)/2] A104293, A104294(n)-A104293(n)=A104295(n)
%F A104294 A104294(n)= A104293(n+1)
%e A104294 a(5)=13 because p((p(5)+1)/2)=p((11+1)/2)=p(6)=13, a(7)=23 because p((p(7)+1)/
               2)=p((17+1)/2)=p(9)=23.
%t A104294 Table[Prime[(Prime[n]+1)/2], {n, 2, 50}]
%Y A104294 Cf. A104293, A104294.
%Y A104294 Sequence in context: A028879 A067567 A163998 this_sequence A137270 A071111 
               A038929
%Y A104294 Adjacent sequences: A104291 A104292 A104293 this_sequence A104295 A104296 
               A104297
%K A104294 easy,nonn
%O A104294 2,1
%A A104294 Zak Seidov (zakseidov(AT)yahoo.com), Feb 28 2005