Position of 3^n in A051037 (5-smooth numbers).

Terms

a(0) =1a(1) =3a(2) =8a(3) =17a(4) =31a(5) =50a(6) =77a(7) =112a(8) =157a(9) =211a(10) =276a(11) =355a(12) =448a(13) =554a(14) =676a(15) =815a(16) =973a(17) =1149a(18) =1344a(19) =1561a(20) =1801a(21) =2064a(22) =2351a(23) =2663a(24) =3003a(25) =3371a(26) =3766a(27) =4190a(28) =4647a(29) =5135