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A044383 Numbers n such that string 5,1 occurs in the base 10 representation of n but not of n-1. 0
51, 151, 251, 351, 451, 510, 551, 651, 751, 851, 951, 1051, 1151, 1251, 1351, 1451, 1510, 1551, 1651, 1751, 1851, 1951, 2051, 2151, 2251, 2351, 2451, 2510, 2551, 2651, 2751, 2851, 2951, 3051, 3151, 3251, 3351, 3451, 3510 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {5, 1}]>0, 1, 0], {n, 3600}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 25 2019 *)

CROSSREFS

Sequence in context: A044302 A044683 A348000 * A044764 A257352 A008883

Adjacent sequences:  A044380 A044381 A044382 * A044384 A044385 A044386

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 28 22:30 EST 2022. Contains 350669 sequences. (Running on oeis4.)