Number of odd prime powers (A246655) between 2^n and 2^(n+1).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =7a(5) =8a(6) =16a(7) =25a(8) =46a(9) =80a(10) =141a(11) =263a(12) =473a(13) =882a(14) =1628a(15) =3044a(16) =5734a(17) =10779a(18) =20428a(19) =38687a(20) =73653a(21) =140425a(22) =268340a(23) =513866a(24) =986033a(25) =1894409a(26) =3646134a(27) =7027825a(28) =13562625a(29) =26208248