Numbers whose base-b expansions, for both b=3 and b=4, include no digits other than 1 and b-1.

Terms

a(0) =1a(1) =5a(2) =7a(3) =13a(4) =23a(5) =53a(6) =125a(7) =215a(8) =373a(9) =1367a(10) =1373a(11) =1375a(12) =3551a(13) =4093a(14) =5471a(15) =5495a(16) =5503a(17) =30581a(18) =30589a(19) =32765a(20) =32767a(21) =56821a(22) =56831a(23) =89557a(24) =96119a(25) =96215a(26) =96223a(27) =97655a(28) =98135a(29) =98141