A043493 Numbers that contain a single 1.

1, 10, 12, 13, 14, 15, 16, 17, 18, 19, 21, 31, 41, 51, 61, 71, 81, 91, 100, 102, 103, 104, 105, 106, 107, 108, 109, 120, 122, 123, 124, 125, 126, 127, 128, 129, 130, 132, 133, 134, 135, 136, 137, 138, 139, 140, 142, 143, 144, 145

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base
• easy

Links

• Enrique Pérez Herrero, Table of n, a(n) for n = 1..2000
• Index entries for 10-automatic sequences.

Crossrefs

A178550 is a subsequence.

Cf. A043489, A043497, A043501, A043505, A043509, A043513, A043517, A043521, A043525, A011531.

Programs

Mathematica

Select[Range[9000],DigitCount[#,10,1]==1&] (* Enrique Pérez Herrero, Nov 29 2013 *)

Formula

a(n) >> n^k where k = log(10)/log(9) = 1.04795.... - Charles R Greathouse IV, Jan 21 2025