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 A301991 #11 Jul 13 2024 17:17:55 %S A301991 185,323,403,527,551,779,959,899,1139,1147,1517,1649,1643,1751,1763, %T A301991 1943,2071,2363,2509,2561,2603,2669,2827,2747,2831,2993,3635,3139, %U A301991 3649,3791,3737,3893,4031,4087,4453,4553,5615,4883,4891,5663,5069 %N A301991 Terms of A301857 where both A301857(n) and its counterpart are composite. %C A301991 A301857 selects the least solutions to A023900 where A023900(j) + A023900(k) = 0 and the pair j,k are coprime. %e A301991 185 is a term because A301857(11) = 185 and both 185 and 273 are composite. %Y A301991 Subsequence of A301857; cf. A023900. %K A301991 nonn %O A301991 1,1 %A A301991 _Torlach Rush_, Mar 30 2018