Number of 5k+4 primes (A030433) in range ]2^n,2^(n+1)].

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =1a(5) =3a(6) =6a(7) =12a(8) =16a(9) =35a(10) =63a(11) =115a(12) =216a(13) =399a(14) =754a(15) =1418a(16) =2705a(17) =5077a(18) =9667a(19) =18403a(20) =35047a(21) =67045a(22) =128509a(23) =246330a(24) =473457a(25) =911409a(26) =1756619a(27) =3390969a(28) =6551382a(29) =12675118