This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A121022 #28 Nov 02 2022 13:47:58
%S A121022 2,12,20,22,24,26,28,32,42,52,62,72,82,92,102,112,120,122,124,126,128,
%T A121022 132,142,152,162,172,182,192,200,202,204,206,208,210,212,214,216,218,
%U A121022 220,222,224,226,228,230,232,234,236,238,240,242,244,246,248,250,252
%N A121022 Even numbers containing a 2 in their decimal representation.
%H A121022 Reinhard Zumkeller, <a href="/A121022/b121022.txt">Table of n, a(n) for n = 1..10000</a>
%H A121022 Seong Ju Kim, R. Stees, L. Taalman, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL19/Stees/stees4.html">Sequences of Spiral Knot Determinants</a>, Journal of Integer Sequences, Vol. 19 (2016), # 16.1.4.
%H A121022 Ryan Stees, <a href="https://commons.lib.jmu.edu/honors201019/84">Sequences of Spiral Knot Determinants</a>, Senior Honors Projects, Paper 84, James Madison Univ., May 2016.
%H A121022 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>.
%F A121022 a(n) ~ 2n. - _Charles R Greathouse IV_, Mar 30 2022
%t A121022 Select[2*Range[200],DigitCount[#,10,2]>0&] (* _Harvey P. Dale_, Nov 04 2013 *)
%o A121022 (Haskell)
%o A121022 a121022 n = a121022_list !! (n-1)
%o A121022 a121022_list = filter (('2' `elem`) . show) [0, 2 ..]
%o A121022 -- _Reinhard Zumkeller_, Nov 08 2013
%o A121022 (PARI) is(n) = n%2==0 && setsearch(vecsort(digits(n)), 2) \\ _Felix Fröhlich_, Nov 22 2020
%Y A121022 Intersection of A005843 and A011532.
%Y A121022 Cf. A121041, A011531, A121023, A121024, A121025, A121026, A121027, A121028, A121029, A121030, A121031, A121032, A121033, A121034, A121035, A121036, A121037, A121038, A121039, A121040.
%K A121022 nonn,base,easy
%O A121022 1,1
%A A121022 _Reinhard Zumkeller_, Jul 21 2006