%N Duplicate of A115760.
%C Or, for i<>j, (a(i)+a(j)/2 are primes.
%C Starting with a(5)=139 on all terms are 19 mod 20.
%C Is sequence finite?
%C Is this a duplicate of A115760? [From _R. J. Mathar_, Jul 22 2010]. Yes, the terms are all 3-mod-4, just as A175533. _Don Reble_, Aug 17 2021.
%Y Cf. A115760, A175532.
%A _Zak Seidov_, Jun 12 2010
%E More terms from _Don Reble_, Aug 17 2021