%I
%S 5,13,31,37,67,127,109,73,103,163,181,151,181,277,271,241,277,331,373,
%T 337,373,463,547,577,523,571,607,547,571,541,547,661,709,733,811,853,
%U 787,769,823,883,859,937,991,1021,1087,1009,1069,1129,1039,1231,1381
%N Primes arising as the arithmetic mean of a pair of successive terms of A086519.
%C Second term onwards every prime == 1 (mod 6).
%C Conjecture: every prime of the type 6k+1 is a member. Comment from _Vim Wenders_, May 27 2008: The conjecture is worng. For example 19 is missing..
%F a(n) = (A086519(n)+A086519(n+1))/2.  _David Wasserman_, Mar 11 2005
%Y Cf. A086519.
%K nonn
%O 1,1
%A _Amarnath Murthy_, Jul 30 2003
%E Corrected and extended by _David Wasserman_, Mar 11 2005
