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 A039936 #8 Apr 27 2017 18:46:15 %S A039936 5,25,25,125,125,125,125,625,625,625,625,625,625,625,625,3125,3125, %T A039936 3125,3125,3125,3125,3125,3125,3125,3125,3125,3125,3125,3125,3125, %U A039936 3125,15625,15625,15625,15625,15625,15625,15625,15625,15625,15625,15625 %N A039936 Smallest k for which k, 2k, ... nk all contain the digit 5. %H A039936 Giovanni Resta, <a href="/A039936/b039936.txt">Table of n, a(n) for n = 1..10000</a> %e A039936 a(3)=25 since 25, 50, and 75 all contain a 5. %Y A039936 Cf. A039932, A039933, A039934, A039935, A039937, A039938, A039939, A039940. %K A039936 base,nonn %O A039936 1,1 %A A039936 _Erich Friedman_ %E A039936 More terms from _Patrick De Geest_, Oct 15 1999