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 A276539 #9 Apr 10 2017 23:32:41 %S A276539 1,4,9,8,9,0,4,8,4,4,1,2,0,8,4,4,3,1,5,6,7,7,3,1,3,2,5,9,5,3,8,1,8,6, %T A276539 4,5,6,9,7,0,6,1,5,7,5,3,7,4,9,4,3,3,5,3,5,7,2,0,5,7,6,4,1,6,7,5,5,9, %U A276539 7,9,6,1,7,3,9,5,5,2,0,2,4,9,7,5,8,0,3,0,3,3,3,1,6,6,7,8,6,6,5,1,2,1,8,0,9 %N A276539 Decimal expansion of the limit of the nested Zeta(1+Zeta(2+Zeta(3+Zeta(4+...)))). %C A276539 No closed form expression is known. Probably transcendental but this is unproved. %e A276539 1.4989048441208443156773132595381864569706157537494335357205764167559796173... %t A276539 RealDigits[Fold[Zeta[#1 + #2] &, 0, Reverse[Range[26]]], 10, 111][[1]] (* or *)RealDigits[Fold[PolyLog[#1 + #2, 1] &, 0, Reverse[Range[30]]], 10, 111][[1]] %K A276539 nonn,cons %O A276539 1,2 %A A276539 _Robert G. Wilson v_, Apr 09 2017