Number of primes of the form x^2 + 1 < 2^n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =2a(4) =3a(5) =4a(6) =5a(7) =6a(8) =8a(9) =10a(10) =12a(11) =14a(12) =18a(13) =24a(14) =33a(15) =42a(16) =54a(17) =70a(18) =91a(19) =114a(20) =158a(21) =212a(22) =293a(23) =393a(24) =539a(25) =713a(26) =957a(27) =1301a(28) =1792a(29) =2459