A044343 Numbers n such that string 1,1 occurs in the base 10 representation of n but not of n-1.

11, 110, 211, 311, 411, 511, 611, 711, 811, 911, 1011, 1100, 1211, 1311, 1411, 1511, 1611, 1711, 1811, 1911, 2011, 2110, 2211, 2311, 2411, 2511, 2611, 2711, 2811, 2911, 3011, 3110, 3211, 3311, 3411, 3511, 3611, 3711, 3811

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {1, 1}]>0, 1, 0], {n, 4000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 05 2019 *)

Crossrefs

Sequence in context: A288136 A287500 A287536 * A132123 A190944 A115822

Adjacent sequences: A044340 A044341 A044342 * A044344 A044345 A044346

Keyword

nonn,base

Author

Clark Kimberling

Status

approved