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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A121022 Even numbers containing a 2 in their decimal representation. 37
 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)
 OFFSET 1,1 LINKS 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. FORMULA a(n) ~ 2n. - Charles R Greathouse IV, Mar 30 2022 MATHEMATICA Select[2*Range[200], DigitCount[#, 10, 2]>0&] (* Harvey P. Dale, Nov 04 2013 *) PROG (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 CROSSREFS 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 KEYWORD nonn,base,easy AUTHOR Reinhard Zumkeller, Jul 21 2006 STATUS approved

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

Last modified February 1 08:20 EST 2023. Contains 359992 sequences. (Running on oeis4.)