A044285 - OEIS

A044285

Numbers n such that string 3,7 occurs in the base 9 representation of n but not of n-1.

34, 115, 196, 277, 306, 358, 439, 520, 601, 682, 763, 844, 925, 1006, 1035, 1087, 1168, 1249, 1330, 1411, 1492, 1573, 1654, 1735, 1764, 1816, 1897, 1978, 2059, 2140, 2221, 2302, 2383, 2464, 2493, 2545, 2626, 2707, 2754

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OFFSET

1,1

LINKS

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

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {3, 7}]>0, 1, 0], {n, 3000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Oct 25 2017 *)

CROSSREFS

Sequence in context: A282854 A165222 A173308 * A044666 A105088 A039521

Adjacent sequences: A044282 A044283 A044284 * A044286 A044287 A044288

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved