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 A215729 #39 Jul 12 2024 14:23:57 %S A215729 0,5,5,115,226,371,1503,8533,27717,27717,69936,848255,1308931,8255246, %T A215729 32564822,39063403 %N A215729 a(n) is the smallest m for which 6^m contains (at least) n consecutive identical digits. %C A215729 a(12) > 838000. - _Chai Wah Wu_, Dec 17 2014 %C A215729 a(14) > 7*10^6. - _Giovanni Resta_, Apr 20 2016 %o A215729 (Python) %o A215729 def A215729(n): %o A215729 l, x = [str(d)*n for d in range(10)], 1 %o A215729 for m in range(10**9): %o A215729 s = str(x) %o A215729 for k in l: %o A215729 if k in s: %o A215729 return m %o A215729 x *= 6 %o A215729 return 'search limit reached' %o A215729 # _Chai Wah Wu_, Dec 17 2014 %Y A215729 Cf. A215735, A045875. %K A215729 nonn,base,more,hard %O A215729 1,2 %A A215729 _V. Raman_, Aug 22 2012 %E A215729 a(11) from _Rick van der Hoorn_, Mar 26 2013 %E A215729 a(12)-a(13) from _Giovanni Resta_, Apr 19 2016 %E A215729 a(14) from _Bert Dobbelaere_, Feb 15 2019 %E A215729 a(15) from _Paul Geneau de Lamarlière_, May 26 2024 %E A215729 a(16) from _Paul Geneau de Lamarlière_, Jul 12 2024