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 A039937 #8 Apr 27 2017 18:47:16 %S A039937 6,63,563,1563,1632,3216,12316,23266,66321,66321,76923,76923,156328, %T A039937 280692,566331,566331,566331,2307692,2307692,2307692,2307692,2307692, %U A039937 2307692,2307692,2307692,11533664,23306676,23306676,23306676,23306676 %N A039937 Smallest k for which k, 2k, ... nk all contain the digit 6. %C A039937 a(197) > 10^12. - _Giovanni Resta_, Apr 27 2017 %H A039937 Giovanni Resta, <a href="/A039937/b039937.txt">Table of n, a(n) for n = 1..196</a> %e A039937 a(2)=63 since 63 and 126 contain a 6. %Y A039937 Cf. A039932, A039933, A039934, A039935, A039936, A039938, A039939, A039940. %K A039937 base,nonn %O A039937 1,1 %A A039937 _Erich Friedman_ %E A039937 More terms from _Patrick De Geest_, Oct 15 1999