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 A044352 Numbers n such that string 2,0 occurs in the base 10 representation of n but not of n-1. 1
 20, 120, 200, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1120, 1200, 1220, 1320, 1420, 1520, 1620, 1720, 1820, 1920, 2000, 2120, 2200, 2220, 2320, 2420, 2520, 2620, 2720, 2820, 2920, 3020, 3120, 3200, 3220, 3320, 3420 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is a (thin) subsequence of the terms of A121040 ending with a 2 followed by one or more zeros and which do not otherwise contain a 2 followed by a 0. This also demonstrates that this sequence is a 10-automatic. - Charles R Greathouse IV, Apr 18 2020 LINKS MATHEMATICA SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {2, 0}]>0, 1, 0], {n, 3500}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 24 2018 *) CROSSREFS Subsequence of A121040. Sequence in context: A244289 A293880 A121040 * A044733 A280439 A093566 Adjacent sequences:  A044349 A044350 A044351 * A044353 A044354 A044355 KEYWORD nonn,base,easy AUTHOR STATUS approved

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Last modified January 24 20:52 EST 2022. Contains 350565 sequences. (Running on oeis4.)