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 A179219 #2 Mar 31 2012 14:41:48 %S A179219 0,2,4,9,8,10,11,49,45,29,289,1372,91125 %N A179219 Iterative mapping: a(1)=0, a(n)=A095904(a(n-1)). %C A179219 a(14) is greater than 10^10 and of the form (p^14)(q^2) where p and q are distinct primes. %H A179219 Will Nicholes, <a href="http://willnicholes.com/math/primesigmap.htm">Iterative mapping of prime signatures</a>. %Y A179219 Cf. A095904, A179220. %K A179219 nonn %O A179219 1,2 %A A179219 _Will Nicholes_, Jul 10 2010