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%I #7 Jan 20 2020 12:51:57
%S 1,2,2,5,10,16,31,47,88,149,290,536,952,1769,3280,6186,11638,21901,
%T 41488,78543,149662,284735,543155,1040577,1994339,3834731,7373228,
%U 14206331,27405523,52941914,102381148
%N Number of primes of the form k*2^n + 1 with k < 2^n.
%C Both even and odd k are counted. Variant of A134876.
%o (PARI) a(n) = sum(k=1,2^n-1,ispseudoprime(k<<n+1))
%Y Cf. A134876.
%K nonn,more
%O 1,2
%A _Jeppe Stig Nielsen_, Jan 19 2020
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