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 A301857 #11 Apr 29 2018 02:36:59 %S A301857 1,13,37,41,61,73,89,97,109,113,185,157,181,193,233,241,277,281,323, %T A301857 313,337,349,353,403,397,401,409,421,433,449,457,461,527,551,521,541, %U A301857 577,593,601,613,617,641,661,673,701,779,733,757,761,769,959,821,829,899,877,881,929,937,953,997,1009,1013,1021,1033,1049 %N A301857 The lesser of j,k, the smallest pair such that A023900(j) + A023900(k) = 0 and j,k are coprime. %C A301857 a(11) is the first term where neither j or k is prime. %C A301857 A301591 is contained in this sequence. %e A301857 1 is a term since A023900(1) + A023900(2) = 0 and gcd(1,2) = 1. %e A301857 185 is a term since A023900(185) + A023900(273) = 0 and gcd(185,273) = 1. %Y A301857 Cf. A023900, A301591, A301374. %K A301857 nonn %O A301857 1,2 %A A301857 _Torlach Rush_, Mar 27 2018