Number of composite numbers between 2^n and 2^(n+1).

Terms

a(0) =0a(1) =0a(2) =1a(3) =5a(4) =10a(5) =24a(6) =50a(7) =104a(8) =212a(9) =436a(10) =886a(11) =1792a(12) =3631a(13) =7319a(14) =14771a(15) =29737a(16) =59826a(17) =120322a(18) =241753a(19) =485652a(20) =974989a(21) =1956815a(22) =3926087a(23) =7874899a(24) =15791397a(25) =31660311a(26) =63463119a(27) =127190437a(28) =254873548a(29) =510663633