A043401 Numbers whose base-7 representation contains exactly one 2.

2, 9, 14, 15, 17, 18, 19, 20, 23, 30, 37, 44, 51, 58, 63, 64, 66, 67, 68, 69, 72, 79, 86, 93, 98, 99, 101, 102, 103, 104, 105, 106, 108, 109, 110, 111, 119, 120, 122, 123, 124, 125, 126, 127, 129, 130, 131, 132, 133, 134, 136, 137, 138

Offset

1,1

Links

Table of n, a(n) for n=1..53.

Mathematica

Select[Range[200], DigitCount[#, 7, 2]==1&] (* Harvey P. Dale, Aug 15 2020 *)

Crossrefs

Cf. A007093.

Sequence in context: A144472 A220249 A071343 * A226953 A274133 A288483

Adjacent sequences: A043398 A043399 A043400 * A043402 A043403 A043404

Keyword

nonn,base

Author

Clark Kimberling

Status

approved