Number of 8k+3 primes (A007520) in range [2^n,2^(n+1)].

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =10a(8) =20a(9) =35a(10) =66a(11) =113a(12) =218a(13) =412a(14) =746a(15) =1460a(16) =2672a(17) =5104a(18) =9651a(19) =18375a(20) =35105a(21) =67165a(22) =128410a(23) =246453a(24) =473535a(25) =911489a(26) =1756670a(27) =3390856a(28) =6552449a(29) =12673142