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 A179216 #2 Mar 31 2012 14:41:48 %S A179216 2,4,3,6,9,5,8,10,25,7,12,27,14,49,11,16,18,125,15,121,13,24,81,20, %T A179216 343,21,169,17,30,40,625,28,1331,22,289,19,32,42,54,2401,44,2197,26, %U A179216 361,23,36,243,66,56,14641,45,4913,33,529,29,48,100,3125,70,88,28561,50,6859 %N A179216 Permutation of triangular array of numbers (greater than 1) arranged by prime signature. %C A179216 The left diagonal is the sequence of primes (A000040). The right diagonal is sequence A025487 (least prime signatures). %H A179216 Will Nicholes, <a href="http://willnicholes.com/math/primesigmap.htm">Iterative mapping of prime signatures</a>. %F A179216 a(n) = A061579(A095904(n)) %Y A179216 Cf. A095904, A179217, A179218, A179221, A179222, A179225, A179226, A179228. %K A179216 nonn,tabl %O A179216 0,1 %A A179216 _Will Nicholes_, Jul 10 2010