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 A355980 #10 Dec 05 2023 16:43:23 %S A355980 2,3,6,9,15,21,44,50,114 %N A355980 Indices of primes in A049685. %C A355980 Related to the search of solutions of the pair of congruences p^2 == -5 (mod q), q^2 == -5 (mod p). %C A355980 Cosgrave and Dilcher list terms up to 25000, including probable primes. %H A355980 J. B. Cosgrave and K. Dilcher, <a href="https://fq.math.ca/Papers1/51-2/CosgraveDilcher-1.pdf">Pairs of reciprocal quadratic congruences involving primes</a>, Fib. Quart. 51 (2) (2013) 98, after Theorem 4. %F A355980 A074281(n) = A049685(a(n)). %F A355980 a(n) = (A074304(n)-1)/2. %Y A355980 Cf. A049685, A074281, A074304. %K A355980 nonn,more %O A355980 1,1 %A A355980 _R. J. Mathar_, Jul 22 2022