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 A179223 #2 Mar 31 2012 14:41:48 %S A179223 1,2,3,4,5,9,10,8,25,343,3969,13090,73344,77398016 %N A179223 Iterative mapping with offset: a(1)=1, a(n)=A095904(a(n-1)-1). %C A179223 a(15) is greater than 10^11 and of the form (p^10)(q^5)(r^2)(s^2)tu, where p, q, r, s, t and u are distinct primes. %H A179223 Will Nicholes, <a href="http://willnicholes.com/math/primesigmap.htm">Iterative mapping of prime signatures</a>. %Y A179223 Cf. A095904, A179224. %K A179223 nonn %O A179223 1,2 %A A179223 _Will Nicholes_, Jul 10 2010