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%I #5 Dec 18 2018 11:48:53
%S 1,3,3,3,1,3,3,3,1,3,3,3,1,3,3,3,7,3,9,1,1,5,3,7,9,3,7,1,1,19,3,0,5,7,
%T 3,3,5
%N a(n) is the least positive number such that in the representation of 2n+1, n>=4, as a sum of the form (2*A000695(k)+a(n))+2(2*A000695(l)+a(n)), both of numbers 2*A000695(k)+a(n) and 2*A000695(l)+a(n) are primes.
%C For a given c>=3, every odd N>=3c is a unique sum of the form (2*A000695(k)+c) +2(2*A000695(l)+c).
%Y Cf. A046927, A103151, A000695, A145812, A147568.
%K nonn,more
%O 4,2
%A _Vladimir Shevelev_, Dec 25 2008