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 A137204 #21 Jun 21 2023 06:38:12 %S A137204 3,0,8,6,1,6,1,2,6,9,6,3,0,4,8,7,5,5,6,9,5,5,8,1,1,2,4,1,5,1,4,1,2,3, %T A137204 3,6,5,2,0,3,0,5,8,2,2,4,7,3,1,7,2,7,4,0,9,4,7,4,8,0,4,4,2,9,4,2,1,5, %U A137204 3,8,1,2,6,0,9,8,4,4,7,3,9,7,9,2,8,5,2,9,4,5,2,8,7,1,0,8,6,0,7,1,1,7,4,0,9 %N A137204 Decimal expansion of e + 1/e. %H A137204 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>. %F A137204 Equals 2*A073743. - _Bruno Berselli_, Mar 14 2013 %e A137204 3.086161269630487556955811241514123365203058224731727... %t A137204 RealDigits[E + 1/E, 10, 120][[1]] (* _Amiram Eldar_, Jun 20 2023 *) %o A137204 (PARI) exp(1)+1/exp(1) \\ _Michel Marcus_, Mar 14 2013 %Y A137204 Cf. A001113, A068985, A073743. %K A137204 nonn,cons %O A137204 1,1 %A A137204 _Mohammad K. Azarian_, Mar 04 2008