Numbers whose base-5 representation is 333333.......3.

Terms

a(0) =0a(1) =3a(2) =18a(3) =93a(4) =468a(5) =2343a(6) =11718a(7) =58593a(8) =292968a(9) =1464843a(10) =7324218a(11) =36621093a(12) =183105468a(13) =915527343a(14) =4577636718a(15) =22888183593a(16) =114440917968a(17) =572204589843