Number of Section I primes between 2^n and 2^(n+1). See A135832.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =5a(5) =7a(6) =9a(7) =13a(8) =18a(9) =21a(10) =28a(11) =43a(12) =56a(13) =62a(14) =72a(15) =94a(16) =133a(17) =142a(18) =187a(19) =241a(20) =313a(21) =376a(22) =436a(23) =517a(24) =709a(25) =858a(26) =982a(27) =1271a(28) =1561a(29) =1814