A023726 Numbers with a single 1 in their base 5 expansion.

1, 5, 7, 8, 9, 11, 16, 21, 25, 27, 28, 29, 35, 37, 38, 39, 40, 42, 43, 44, 45, 47, 48, 49, 51, 55, 57, 58, 59, 61, 66, 71, 76, 80, 82, 83, 84, 86, 91, 96, 101, 105, 107, 108, 109, 111, 116, 121, 125, 127, 128, 129, 135, 137, 138, 139