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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
FORMULA
a(n) ~ n. - Charles R Greathouse IV, Nov 02 2022
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. 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: A357042 A299965 A244289 * A121040 A044352 A044733
KEYWORD
nonn,base,easy
AUTHOR
M. F. Hasler, Oct 18 2017
STATUS
approved

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)