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 A360507 #12 Feb 19 2023 16:22:47 %S A360507 2,5,13,57,109,638,3069 %N A360507 Numbers k such that A360506(k) is prime. %C A360507 Analogous to A360503, which gives the primes in A048435. %H A360507 <a href="/index/Mo#MWP">Index entries for sequences related to Most Wanted Primes video</a> %e A360507 A360506(5) = 4003 is prime, so 5 is a term. %Y A360507 Cf. A048435, A360503, A360506. %K A360507 nonn,base,more %O A360507 1,1 %A A360507 _Rémy Sigrist_ and _N. J. A. Sloane_, Feb 18 2023 %E A360507 a(6)-a(7) from _Michael S. Branicky_, Feb 18 2023