Number of 8-almost primes 8ap such that 2^n < 8ap <= 2^(n+1).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =1a(9) =5a(10) =8a(11) =22a(12) =47a(13) =101a(14) =229a(15) =473a(16) =1044a(17) =2171a(18) =4634a(19) =9796a(20) =20513a(21) =43020a(22) =89684a(23) =187361a(24) =388633a(25) =807508a(26) =1671160a(27) =3455934a(28) =7135226a(29) =14708436