Number of 8k+5 primes (A007521) in range ]2^n,2^(n+1)].

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =6a(7) =11a(8) =20a(9) =35a(10) =63a(11) =118a(12) =216a(13) =407a(14) =759a(15) =1424a(16) =2686a(17) =5094a(18) =9652a(19) =18472a(20) =35068a(21) =67068a(22) =128421a(23) =246403a(24) =473647a(25) =911479a(26) =1757076a(27) =3390256a(28) =6552075a(29) =12675294