Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #5 Mar 13 2015 00:26:00
%S 2,3,3,19,19,13,13,19,37,3,19,31,31,67,127,379,607,31,19,577,181,67,
%T 97,31,349,619,97,919,31,211,577,181,13,397,31,829,19,577,577,103,
%U 1669,199,19,31,439,1021,601,1621,2017,733,3,199,2113,619,1861,1297,241,967
%N Smallest prime q(n) such that -q(n)+2^p(n) is a prime, where p(n) = n-th prime.
%e n = 4, p(4) = 11, 2^11 = 2048, p2 = 2048-p1 is satisfied at first with prime p1 = 19 resulting in prime p2 = 2029, so q(4) = 19. n = 31, p(31) = 127, p2 = 2^127-p1 is satisfied first with p1 = 577 and p2 = 170141183460469231731687303715884105151 So q(31) = 577, the 106th prime.
%Y Cf. A057662, A056206, A056208.
%K nonn
%O 0,1
%A _Labos Elemer_, Oct 19 2000