A044733 Numbers n such that string 2,0 occurs in the base 10 representation of n but not of n+1.

20, 120, 209, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1120, 1209, 1220, 1320, 1420, 1520, 1620, 1720, 1820, 1920, 2099, 2120, 2209, 2220, 2320, 2420, 2520, 2620, 2720, 2820, 2920, 3020, 3120, 3209, 3220, 3320, 3420

Offset

1,1

Links

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

Mathematica

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {2, 0}]>0, 1, 0], {n, 3500}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Aug 05 2016 *)

Crossrefs

Sequence in context: A293880 A121040 A044352 * A280439 A093566 A213223

Adjacent sequences: A044730 A044731 A044732 * A044734 A044735 A044736

Keyword

nonn,base

Author

Clark Kimberling

Status

approved