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%I #4 Mar 30 2012 18:52:27
%S 2,13,17,19,67,83,197,257,311,409,419,557,571,587,659,677,677,733,773,
%T 827,853,877,881,971,983,1087,1123,1171,1171,1229,1259,1279,1283,1367,
%U 1423,1429,1499,1543,1657,1733,1741,1759,1759,1777,1871,1871,1877,1907
%N Primes of the form (p(2*n)-p(n))/2, where p(n)=n-th prime.
%e If n=2, then (p(2*2)-p(2))/2=(7-3)/2=2=a(1).
%e If n=7, then (p(2*7)-p(7))/2=(43-17)/2=13=a(2).
%e If n=8, then (p(2*8)-p(8))/2=(53-19)/2=17=a(3).
%e If n=9, then (p(2*9)-p(9))/2=(61-23)/2=19=a(4).
%e If n=24, then (p(2*24)-p(24))/2=(223-89)/2=67=a(5), etc.
%Y Cf. A000040.
%K nonn
%O 1,1
%A _Juri-Stepan Gerasimov_, Sep 18 2008
%E 739 replaced by 733, 983 added, 1759 duplicated etc. by _R. J. Mathar_, Oct 04 2008
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