Number of integers m such that 7^n < 2^m < 7^(n+1).

Terms

a(0) =2a(1) =3a(2) =3a(3) =3a(4) =3a(5) =2a(6) =3a(7) =3a(8) =3a(9) =3a(10) =2a(11) =3a(12) =3a(13) =3a(14) =3a(15) =2a(16) =3a(17) =3a(18) =3a(19) =3a(20) =2a(21) =3a(22) =3a(23) =3a(24) =3a(25) =2a(26) =3a(27) =3a(28) =3a(29) =3