Numbers whose base-5 representation has the same nonzero number of 1's and 4's.

Terms

a(0) =9a(1) =21a(2) =29a(3) =39a(4) =44a(5) =45a(6) =47a(7) =48a(8) =59a(9) =71a(10) =84a(11) =96a(12) =101a(13) =105a(14) =107a(15) =108a(16) =111a(17) =116a(18) =129a(19) =139a(20) =144a(21) =145a(22) =147a(23) =148a(24) =174a(25) =179a(26) =189a(27) =194a(28) =195a(29) =197