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A293880 Numbers having '20' as substring of their digits. 11
20, 120, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1120, 1200, 1201, 1202, 1203, 1204, 1205, 1206, 1207, 1208, 1209, 1220, 1320, 1420, 1520, 1620, 1720, 1820, 1920, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 20 of A292690 and A293869. A121040 lists the terms which are divisible by 19.

LINKS

Table of n, a(n) for n=1..51.

Index entries for 10-automatic sequences

MAPLE

select(n->searchtext("20", convert(n, string))>0, [$1...2010]); # Paolo P. Lava, Sep 05 2018

MATHEMATICA

Select[Range[2100], SequenceCount[IntegerDigits[#], {2, 0}]>0&] (* Harvey P. Dale, Jul 25 2021 *)

PROG

(PARI) is_A293880 = has(n, p=20, m=10^#Str(p))=until(p>n\=10, n%m==p&&return(1))

CROSSREFS

Cf. A292690, A293869.

Cf. A011540, A011531, A011532, A011533, A011534, A011535, A011536, A011537, A011538, A011539: analog for '0' - '9'.

Cf. A293870, A293871, A293872, A293873, A293874, A293875, A293876, A293877, A293878, A293879: same for '10' - '19'.

Cf. A121041, A121022, A121023, A121024, A121025, A121026, A121027, A121028, A121029, A121030, A121031, A121032, A121033, A121034, A121035, A121036, A121037, A121038, A121039, A121040: subsequences of the above, containing only multiples of the pattern p.

Sequence in context: A258667 A299965 A244289 * A121040 A044352 A044733

Adjacent sequences:  A293877 A293878 A293879 * A293881 A293882 A293883

KEYWORD

nonn,base,easy

AUTHOR

M. F. Hasler, Oct 18 2017

STATUS

approved

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Last modified January 18 09:26 EST 2022. Contains 350454 sequences. (Running on oeis4.)