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 A139342 #21 Feb 08 2022 02:38:53 %S A139342 1,9,8,2,8,8,1,5,2,8,6,2,2,0,6,2,3,2,2,6,7,8,8,8,9,5,6,6,0,4,8,6,4,6, %T A139342 7,0,8,4,2,0,8,4,8,9,2,5,0,1,2,9,7,1,6,5,2,7,4,2,6,1,9,3,1,8,0,2,6,4, %U A139342 2,4,6,0,4,1,7,1,5,0,7,9,1,4,1,9,6,1,8,1,4,5,3,1,6,6,5,3,4,4,6,2,6,8,4,8 %N A139342 Decimal expansion of e^(-(1+sqrt(5))/2). %C A139342 By the Lindemann-Weierstrass theorem, this constant is transcendental. - _Charles R Greathouse IV_, May 13 2019 %H A139342 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>. %F A139342 Equals exp(-A001622). %F A139342 Equals 1/A139341. - _Amiram Eldar_, Feb 08 2022 %e A139342 0.19828815286220623226788895660486467084208489250129... %p A139342 evalf(exp(1)^(-(1+sqrt(5))/2),100); # _Wesley Ivan Hurt_, Feb 09 2017 %t A139342 RealDigits[E^-GoldenRatio,10,120][[1]] (* _Harvey P. Dale_, Dec 30 2020 *) %o A139342 (PARI) exp(-(sqrt(5)+1)/2) \\ _Charles R Greathouse IV_, May 13 2019 %Y A139342 Cf. A001622, A094214, A104457, A098317, A002390, A139339, A139340, A139341. %K A139342 nonn,cons %O A139342 0,2 %A A139342 _Mohammad K. Azarian_, Apr 14 2008 %E A139342 Leading zero removed by _R. J. Mathar_, Feb 05 2009