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A121022
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Even numbers containing a 2 in their decimal representation.
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37
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2, 12, 20, 22, 24, 26, 28, 32, 42, 52, 62, 72, 82, 92, 102, 112, 120, 122, 124, 126, 128, 132, 142, 152, 162, 172, 182, 192, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
Seong Ju Kim, R. Stees, L. Taalman, Sequences of Spiral Knot Determinants, Journal of Integer Sequences, Vol. 19 (2016), # 16.1.4.
Ryan Stees, Sequences of Spiral Knot Determinants, Senior Honors Projects, Paper 84, James Madison Univ., May 2016.
Index entries for 10-automatic sequences.
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FORMULA
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a(n) ~ 2n. - Charles R Greathouse IV, Mar 30 2022
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MATHEMATICA
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Select[2*Range[200], DigitCount[#, 10, 2]>0&] (* Harvey P. Dale, Nov 04 2013 *)
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PROG
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(Haskell)
a121022 n = a121022_list !! (n-1)
a121022_list = filter (('2' `elem`) . show) [0, 2 ..]
-- Reinhard Zumkeller, Nov 08 2013
(PARI) is(n) = n%2==0 && setsearch(vecsort(digits(n)), 2) \\ Felix Fröhlich, Nov 22 2020
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CROSSREFS
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Intersection of A005843 and A011532.
Cf. A121041, A011531, A121023, A121024, A121025, A121026, A121027, A121028, A121029, A121030, A121031, A121032, A121033, A121034, A121035, A121036, A121037, A121038, A121039, A121040.
Sequence in context: A043497 A051804 A352262 * A277589 A069164 A067762
Adjacent sequences: A121019 A121020 A121021 * A121023 A121024 A121025
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KEYWORD
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nonn,base,easy
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AUTHOR
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Reinhard Zumkeller, Jul 21 2006
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STATUS
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approved
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