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 A131548 #15 Jul 23 2024 21:03:54 %S A131548 8,27,33,33,274,2076,5173,8880,67390,206131,864271,1291676,5756979, %T A131548 13654248,73000220 %N A131548 Least power of 3 having a run of exactly n consecutive 5's in its decimal representation. %e A131548 a(3) = 33 because 3^33 = 5559060566555523 is the smallest power of 3 that contains a run of exactly 3 consecutive 5's in its decimal form. (3^33 happens to contain also a run of exactly 4 consecutive 5's, so a(4) is also 33.) %Y A131548 Cf. A195269, A131552, A131551, A131550, A131549, A131547, A131546, A131545, A131544. %K A131548 more,nonn,base %O A131548 1,1 %A A131548 _Shyam Sunder Gupta_, Aug 26 2007 %E A131548 a(11)-a(14) from _Lars Blomberg_, Feb 02 2013 %E A131548 a(15) from _Bert Dobbelaere_, Mar 05 2019 %E A131548 a(3) corrected by _Pontus von Brömssen_, Jul 21 2024