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 A359180 #31 Apr 11 2023 03:47:30 %S A359180 2,3,6,18,19,82,1298,3139,3687,4637 %N A359180 Numbers k such that k!^2 / 2 + 1 is prime. %e A359180 3!^2 / 2 + 1 = 6^2/2 + 1 = 19, a prime number, so 3 is a term. %o A359180 (PARI) isok(k) = (k>1) && isprime(k!^2 / 2 + 1); \\ _Michel Marcus_, Jan 15 2023 %Y A359180 Cf. A002981, A046029, A358805, A358878. %K A359180 nonn,hard,more %O A359180 1,1 %A A359180 _Arsen Vardanyan_, Dec 18 2022 %E A359180 a(7) from _Michael S. Branicky_, Dec 18 2022 %E A359180 a(8)-a(10) from _Michael S. Branicky_, Apr 10 2023