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 A131571 #7 Nov 04 2013 13:01:49 %S A131571 0,1,2,3,4,5,6,7,8,9,25,107495424 %N A131571 Fixed points of the map m -> powerback(m) (see A133048 for definition). %C A131571 Probably there are no other terms. There are no other terms below 10^100. %e A131571 Under the powerback map of A133048, 25 -> 5^2 = 25, 107495424 -> 4^2*4^5*9^4*7^0*1 = 107495424. %Y A131571 Cf. A133048, A135385. %K A131571 nonn,base %O A131571 1,3 %A A131571 _J. H. Conway_ and _N. J. A. Sloane_, Dec 31 2007