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 A193743 #10 Apr 03 2023 10:36:12 %S A193743 5,8,1,5,4,5,9,9,8,8,7,2,2,3,2,8,2,9,4,0,7 %N A193743 Decimal expansion of the only positive real solution to x^2/2! - x^3/3! + x^5/5! - x^7/7! + x^11/11! - ... = 0, using the prime numbers (2, 3, 5, 7 ...) %C A193743 The constant is 5. 8154599887 2232829407 3007970995 6593490083 3301145... %H A193743 Michael Hartley, <a href="https://t5k.org/curios/page.php?curio_id=5286">5.8154...</a>, Prime curios %Y A193743 Cf. A078756, A084257 %K A193743 cons,nonn %O A193743 1,1 %A A193743 _Kausthub Gudipati_, Aug 03 2011