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 A104356 #3 Mar 30 2012 18:50:49 %S A104356 1,5,10,15,20,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536, %T A104356 131072,262144,524288,1048576,2097152,4194304,8388608,16777216, %U A104356 33554432,67108864,134217728,268435456,536870912,1073741824,2147483648 %N A104356 Smallest m such that A104350(m) has exactly n trailing zeros in decimal representation. %C A104356 A104355(a(n)) = n and A104355(m) < n for m < a(n). %F A104356 a(n) = if n=0 then 1 else (if n<5 then 5*n else 2^n). %K A104356 nonn,base %O A104356 0,2 %A A104356 _Reinhard Zumkeller_, Mar 06 2005