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 A073231 #5 Jul 16 2025 12:55:13
%S A073231 5,0,0,4,7,3,5,0,0,5,6,3,6,3,6,8,4,0,5,4,5,1,3,4,9,0,1,3,3,7,9,0,4,5,
%T A073231 7,2,8,0,3,4,5,3,2,1,5,3,4,2,2,8,3,0,0,6,4,9,7,9,0,9,3,5,2,7,8,3,7,5,
%U A073231 7,3,2,1,1,6,2,6,1,4,3,3,4,4,3,5,1,0,6,5,0,8,2,6,5,0,9,6,5,7,5,8,9,9,3,4
%N A073231 Decimal expansion of (1/e)^(1/e)^(1/e).
%e A073231 0.50047350056363684054513490133...
%t A073231 With[{c=1/E},RealDigits[c^c^c,10,120][[1]]] (* _Harvey P. Dale_, Jul 16 2025 *)
%o A073231 (PARI) exp(-1)^exp(-1)^exp(-1)
%Y A073231 Cf. A001113 (e), A068985 (1/e), A072364 ((1/e)^(1/e)), A030178 (limit of (1/e)^(1/e)^...^(1/e)), A073232 (((1/e)^(1/e))^(1/e)), A073227 (e^e^e).
%K A073231 cons,nonn
%O A073231 0,1
%A A073231 _Rick L. Shepherd_, Jul 22 2002