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 A258504 #5 Jun 01 2015 14:45:21 %S A258504 6,9,4,8,2,3,3,6,0,7,2,7,9,1,6,7,9,5,5,0,0,9,3,9,1,7,0,8,9,8,3,1,4,5, %T A258504 4,7,1,5,6,5,9,1,4,2,0,6,8,1,5,5,3,9,9,4,0,2,6,0,4,0,5,5,4,4,0,9,7,2, %U A258504 1,3,2,5,9,9,4,5,4,1,5,3,9,4,1,7,0,5,2,5,0,7,0,2,8,6,2,0,0,0,7,4,5,1,9,7,9 %N A258504 Decimal expansion of (27/64)^(27/64) = (81/256)^(81/256). %H A258504 Jonathan Sondow, Diego Marques, <a href="http://arxiv.org/abs/1108.6096">Algebraic and transcendental solutions of some exponential equations</a>, Annales Mathematicae et Informaticae 37 (2010) 151-164 %F A258504 x^x = y^y <==> (1/x)^(1/y) = (1/y)^(1/x), hence, from A258503: %F A258504 (64/27)^(256/81) = (256/81)^(64/27) <==> (27/64)^(27/64) = (81/256)^(81/256). %e A258504 0.6948233607279167955009391708983145471565914206815539940260405544... %t A258504 RealDigits[(27/64)^(27/64), 10, 105] // First %Y A258504 Cf. A194556, A194789, A258503. %K A258504 nonn,cons,easy %O A258504 0,1 %A A258504 _Jean-François Alcover_, Jun 01 2015