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 A181582 #12 Aug 22 2017 15:09:57 %S A181582 5,47,409,4007,40013,400009,0,0,0,4000000019,0,400000000019,0,0,0,0,0, %T A181582 0,0,40000000000000000019,0,0,0,0,4000000000000000000000039,0,0,0,0,0, %U A181582 0,0,0,0,40000000000000000000000000000000037,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,400000000000000000000000000000000000000000000000057 %N A181582 Smallest prime p such that p! ends with exactly 10^n trailing 0's (or 0, if no such p exists). %H A181582 A. M. Oller-Marcen, J. Maria Grau, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL14/Oller/oller3.html">On the Base-b Expansion of the Number of Trailing Zeros of b^k!</a>, J. Int. Seq. 14 (2011) 11.6.8 %F A181582 a(n)=0 or a(n)>4*10^n %Y A181582 Cf. A173558, A080087. %K A181582 nonn,base %O A181582 0,1 %A A181582 _Lekraj Beedassy_, Nov 02 2010 %E A181582 More terms from _Robert Gerbicz_, Nov 21 2010