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 A100121 #3 Mar 30 2012 17:38:59 %S A100121 1,8,6,0,2,0,9,4,1,1,4,5,5,6,0,6,5,6,2,2,9,1,7,3,1,9,7,6,2,0,8,2,1,8, %T A100121 6,2,4,7,3,8,9,8,9,8,9,8,7,6,0,3,5,8,6,5,5,7,7,1,9,8,3,0,0,8,7,6,6,6, %U A100121 1,7,4,6,5,1,1,1,7,8,6,1,5,8,2,8,1,1,8,6,9,8,7,2,7,9,7,5,9,9,9,9 %N A100121 Limit of the power tower t(2)^(t(3)^(t(5)^(t(7)^(...)))) with t(n)=n^(1/n) and n taking prime values. %e A100121 1.860209411455606562291731976208218624738989898760358655771983008766617465111786158281186987279759999... %o A100121 (PARI) default(realprecision,100):t=1:forstep(n=100,1,-1,t=(prime(n)^(1/prime(n)))^t):return(t) %Y A100121 Cf. A100120, A098454, A098584 and references in these. %K A100121 cons,nonn %O A100121 1,2 %A A100121 Mark Hudson (mrmarkhudson(AT)hotmail.com), Nov 09 2004 %E A100121 Offset corrected by _R. J. Mathar_, Feb 05 2009