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 A039933 #12 Oct 10 2019 03:56:21 %S A039933 2,12,124,624,624,642,4062,4062,4128,4128,23041,23041,23041,23041, %T A039933 144032,144032,144032,144032,144032,144032,144032,1201804,1201804, %U A039933 1201804,1276048,1276048,1276048,1276048,1276048,1276048,8020604 %N A039933 Smallest k for which k, 2k, ... n*k all contain the digit 2. %C A039933 a(288) > 5*10^11. - _Giovanni Resta_, Apr 27 2017 %H A039933 Giovanni Resta, <a href="/A039933/b039933.txt">Table of n, a(n) for n = 1..287</a> %e A039933 a(3)=624 since 624, 1248, and 1872 all contain a 2. %Y A039933 Cf. A039932, A039934, A039935, A039936, A039937, A039938, A039939, A039940. %K A039933 base,nonn %O A039933 1,1 %A A039933 _Erich Friedman_ %E A039933 More terms from _Patrick De Geest_, Oct 15 1999