Numbers with a single 1 in their base 5 expansion.

Terms

a(0) =1a(1) =5a(2) =7a(3) =8a(4) =9a(5) =11a(6) =16a(7) =21a(8) =25a(9) =27a(10) =28a(11) =29a(12) =35a(13) =37a(14) =38a(15) =39a(16) =40a(17) =42a(18) =43a(19) =44a(20) =45a(21) =47a(22) =48a(23) =49a(24) =51a(25) =55a(26) =57a(27) =58a(28) =59a(29) =61