login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

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

Index entries for 10-automatic sequences

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

Clark Kimberling

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

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