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 A018861 #11 Jan 29 2017 08:53:17 %S A018861 1,25,3125,48828125,5,625,78125,88817841970012523233890533447265625, %T A018861 9765625,108420217248550443400745280086994171142578125, %U A018861 11920928955078125,125,1387778780781445675529539585113525390625,1490116119384765625,15625 %N A018861 Smallest power of 5 that begins with n. %H A018861 Seiichi Manyama, <a href="/A018861/b018861.txt">Table of n, a(n) for n = 1..326</a> %F A018861 a(n) = 5^A018862(n). - _Seiichi Manyama_, Jan 29 2017 %F A018861 a(5^n) = 5^n for n >= 0. - _Seiichi Manyama_, Jan 29 2017 %Y A018861 Cf. A018802 (k=2), A018857 (k=3), A018859 (k=4), this sequence (k=5), A018863 (k=6), A018865 (k=7), A018867 (k=8), A018869 (k=9). %K A018861 nonn,base %O A018861 1,2 %A A018861 _David W. Wilson_