[seqfan] 2^n + p = prime/composite

[Leroy Quet]

Are either of these sequences already in the EIS, possibly with a different (non-obviously identical) definition?

a) a(n) = number of primes p, p <= 2^n, where 2^n + p is prime.
(Offset = 0).
0,0,1,2,3,3,5,...

b) b(n) = number of primes p, p <= 2^n, where 2^n + p is composite.
(Offset = 0).

0,1,1,2,3,8,13,...

Thanks,
Leroy Quet


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