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 A084257 #4 Apr 03 2023 10:36:10 %S A084257 2,3,0,7,5,0,5,2,9,3,7,5,0,3,8,2,0,3,5,2,9,0,4,7,0,0,3,2,4,0,4,9,5,1, %T A084257 4,4,4,4,1,9,8,8,4,3,2,8,6,6,8,1,5,0,8,8,9,2,9,3,6,1,5,3,0,2,6,9,6,8, %U A084257 1,9,6,9,5,7,9,5,6,8,3,9,2,3,3,2,1,4,4,5,2,7,1,6,1,5,1,1,4,6,4 %N A084257 Decimal expansion of -x where x^2/2! + x^3/3! + x^5/5! + x^7/7! + x^11/11! + x^13/13! + ... = 0. %C A084257 This is the only nonzero real solution. %H A084257 Submitted to Prime Curios! by <a href="https://t5k.org/curios/ByOne.php?submitter=Hartley">Michael Hartley</a>. %H A084257 G. L. Honaker, Jr., <a href="https://t5k.org/curios/page.php?number_id=2714">Prime Curios!: -2.307505293750382035...</a> %e A084257 -2.307505293750382035... %Y A084257 Cf. A000040, A084256, A084256. %K A084257 nonn,cons %O A084257 1,1 %A A084257 _Frank Ellermann_, May 23 2003