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 A365326 #35 Oct 05 2023 14:27:50 %S A365326 2,5,13,83,463,4217,169333,2273237,23239523,512974197,5572561567 %N A365326 a(n) is the smallest positive number k such that k^2 - 1 and k^2 + 1 each have exactly n distinct prime divisors. %F A365326 a(n) >= max(A219017(n), A180278(n)). - _Daniel Suteu_, Sep 03 2023 %o A365326 (PARI) isok(k, n) = (omega(k^2-1)==n) && (omega(k^2+1)==n); %o A365326 a(n) = my(k=2); while (!isok(k, n), k++); k; \\ _Michel Marcus_, Sep 03 2023 %Y A365326 Cf. A001221, A180278, A219017. %Y A365326 Cf. A088075 (with k instead of k^2). %K A365326 nonn,more %O A365326 1,1 %A A365326 _Juri-Stepan Gerasimov_, Sep 01 2023 %E A365326 a(9)-a(11) from _Amiram Eldar_, Sep 03 2023