A044357 - OEIS

A044357

Numbers n such that string 2,5 occurs in the base 10 representation of n but not of n-1.

25, 125, 225, 250, 325, 425, 525, 625, 725, 825, 925, 1025, 1125, 1225, 1250, 1325, 1425, 1525, 1625, 1725, 1825, 1925, 2025, 2125, 2225, 2250, 2325, 2425, 2500, 2625, 2725, 2825, 2925, 3025, 3125, 3225, 3250, 3325, 3425

(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], {2, 5}]>0, 1, 0], {n, 3500}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Oct 27 2019 *)

CROSSREFS

Sequence in context: A225388 A369563 A146945 * A044738 A062672 A036321

Adjacent sequences: A044354 A044355 A044356 * A044358 A044359 A044360

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved