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 A216707 #32 Oct 20 2021 07:50:22 %S A216707 5,3,5,4,9,1,6,5,5,5,2,4,7,6,4,7,3,6,5,0,3,0,4,9,3,2,9,5,8,9,0,4,7,1, %T A216707 8,1,4,7,7,8,0,5,7,9,7,6,0,3,2,9,4,9,1,5,5,0,7,2,0,5,2,5,5,0,3,7,3,1, %U A216707 4,4,9,4,5,4,3,9,6,6,2,7,2,1,3,6,0,9,1,5,3,8,9,8,3,0,4,6,1,8,8,5,9,8,8,0,4 %N A216707 Decimal expansion of e^(2*Pi). %C A216707 Gelfond's constant squared. %C A216707 The proportionate distance between images of an object (e.g., galaxy) seen behind a nonrotating (Schwarzschild) black hole, see Sneppen link. The factor is reduced for rotating (Kerr) black holes. - _Charles R Greathouse IV_, Oct 17 2021 %H A216707 Albert Sneppen, <a href="https://doi.org/10.1038/s41598-021-93595-w">Divergent reflections around the photon sphere of a black hole</a>, Scientific Reports 11, 14247 (2021). %H A216707 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A216707 Equals A039661^2. %F A216707 Equals (i^i)^(-4). %e A216707 535.4916555247647365030493295890471814778057976032949155072052550373... %t A216707 RealDigits[E^(2*Pi), 10, 105][[1]] (* _T. D. Noe_, Sep 17 2012 *) %o A216707 (PARI) exp(2*Pi) \\ _Charles R Greathouse IV_, May 14 2019 %Y A216707 Cf. A039661. %K A216707 nonn,cons %O A216707 3,1 %A A216707 _John W. Nicholson_, Sep 16 2012