A044349 Numbers n such that string 1,7 occurs in the base 10 representation of n but not of n-1.

17, 117, 170, 217, 317, 417, 517, 617, 717, 817, 917, 1017, 1117, 1170, 1217, 1317, 1417, 1517, 1617, 1700, 1817, 1917, 2017, 2117, 2170, 2217, 2317, 2417, 2517, 2617, 2717, 2817, 2917, 3017, 3117, 3170, 3217, 3317, 3417

Offset

1,1

Links

Table of n, a(n) for n=1..39.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {1, 7}]>0, 1, 0], {n, 3500}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 23 2021 *)

Crossrefs

Sequence in context: A222370 A032692 A293877 * A044730 A086020 A056117

Adjacent sequences: A044346 A044347 A044348 * A044350 A044351 A044352

Keyword

nonn,base

Author

Clark Kimberling

Status

approved