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 A258249 #5 Jun 26 2025 12:35:03
%S A258249 2,7,3,11,43,5,13,17,47,19,23,61,29,41,59,31,53,67,71,79,37,83,73,101,
%T A258249 89,103,127,97,107,113,131,139,109,151,149,137,163,157,173,197,167,
%U A258249 179,181,191,193,223,227,199,233,211,229,239,241,263,251,269,257,271,277,281,283,311,293,307,317,331
%N A258249 Lexicographically smallest sequence of primes such that Legendre symbol (a(1)*...*a(n-1) / a(n)) = 1 for all n.
%o A258249 (PARI) { P=1; for(n=1,100, p=2; while( kronecker(p,P)!=1, p=nextprime(p+1)); print1(p,", "); P*=p) }
%Y A258249 Cf. A167604.
%K A258249 nonn
%O A258249 1,1
%A A258249 _Max Alekseyev_, May 24 2015