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%I #8 Sep 28 2013 01:35:05
%S 0,0,0,2,0,2,4,2,0,4,4,10,4,2,4,20,0,2,6,2,4,10,4,16,4,40,6,40,58,4,
%T 36,2,6,10,42,32,6,26,46,8,88,22,12,58,18,56,22,116,60,82,28,130,48,
%U 112,34,56,6,14,28,56,94,2,58,26,60,50,6,20,24,20,36,232,94,70,36,98,16,34
%N Least k such that 2^n+1-k is a prime.
%e a(5)=2 because 2^5+1-2=31 that is a prime.
%o (PARI) a(n) = my(k = 0); while (! isprime(2^n+1-k), k++); k; \\ _Michel Marcus_, Sep 28 2013
%Y Cf. A016014.
%K nonn
%O 0,4
%A _Felice Russo_
%E More terms from _Erich Friedman_
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