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 A098941 #13 Dec 10 2024 05:27:18
%S A098941 2,12,21,22,23,25,27,29,32,52,72,92,112,121,122,123,125,127,129,132,
%T A098941 152,172,192,211,212,213,215,217,219,221,222,223,225,227,229,231,232,
%U A098941 233,235,237,239,251,252,253,255,257,259,271,272,273,275,277,279,291,292
%N A098941 Numbers where 2 is the only even decimal digit.
%C A098941 This is a 10-automatic language. - _Charles R Greathouse IV_, Oct 05 2011
%H A098941 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>
%t A098941 Select[Range[300],Union[Select[IntegerDigits[#],EvenQ]]=={2}&] (* _Harvey P. Dale_, May 20 2012 *)
%o A098941 (Perl) for (0..1000) {
%o A098941 print "$_, " if (/^[123579]*2[123579]*$/)
%o A098941 } # _Charles R Greathouse IV_, Oct 05 2011
%K A098941 base,easy,nonn
%O A098941 1,1
%A A098941 _Eric Angelini_, Oct 21 2004