Numbers with a single 4 in their base 5 expansion.

Terms

a(0) =4a(1) =9a(2) =14a(3) =19a(4) =20a(5) =21a(6) =22a(7) =23a(8) =29a(9) =34a(10) =39a(11) =44a(12) =45a(13) =46a(14) =47a(15) =48a(16) =54a(17) =59a(18) =64a(19) =69a(20) =70a(21) =71a(22) =72a(23) =73a(24) =79a(25) =84a(26) =89a(27) =94a(28) =95a(29) =96