Number of 5-almost primes 5ap such that 2^n < 5ap <= 2^(n+1).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =5a(7) =8a(8) =21a(9) =41a(10) =91a(11) =199a(12) =403a(13) =873a(14) =1767a(15) =3740a(16) =7709a(17) =15910a(18) =32759a(19) =67185a(20) =138063a(21) =281566a(22) =576165a(23) =1173435a(24) =2390366a(25) =4860357a(26) =9873071a(27) =20033969a(28) =40612221a(29) =82266433