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 A116064 #15 Mar 11 2024 04:20:37 %S A116064 7744,665500,774400,5556600,6655000,7744000,55566000,66550000, %T A116064 77440000,447722888,448855888,555660000,665500000,774400000, %U A116064 1155775544,5500002244,5511005500,5556600000,6655000000,7744000000,11000004488,11122233444,22244466888 %N A116064 Powerful numbers (A001694) made of nontrivial runs of identical digits. %C A116064 A run of length 1 is trivial. %H A116064 Amiram Eldar, <a href="/A116064/b116064.txt">Table of n, a(n) for n = 1..201</a> (terms below 10^18) %H A116064 <a href="/index/Pow#powerful">Index entries for sequences related to powerful numbers</a>. %e A116064 448855888 = 2^4*13^3*113^2. %Y A116064 Intersection of A001694 and A033023. %K A116064 nonn,base %O A116064 1,1 %A A116064 _Giovanni Resta_, Feb 13 2006 %E A116064 a(16)-a(23) from _Donovan Johnson_, Jun 29 2011