Numbers whose base-11 representation has the same nonzero number of 1's and 4's.

Terms

a(0) =15a(1) =45a(2) =125a(3) =147a(4) =158a(5) =165a(6) =167a(7) =168a(8) =170a(9) =171a(10) =172a(11) =173a(12) =174a(13) =175a(14) =180a(15) =191a(16) =202a(17) =213a(18) =224a(19) =235a(20) =257a(21) =287a(22) =378a(23) =408a(24) =485a(25) =495a(26) =497a(27) =498a(28) =500a(29) =501