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 A318239 #14 May 26 2019 19:42:12 %S A318239 2,3,5,6,7,10,11,12,18,20,24,40,42,45,48,54,72,80,96 %N A318239 a(n) is the smallest primitive root of A133433(n). %C A318239 Also with an initial 1, numbers k such that A023048(k) set a new record. %C A318239 If A023048(108) != 0 (which is implied assuming generalized Artin's conjecture) then the next term of this sequence is 108. %C A318239 Conjecturally 11 is the largest prime in this sequence, 42 is the largest squarefree term, and 45 is the largest odd term. %H A318239 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/p_roots.html">Least primitive root of prime numbers</a> %e A318239 The smallest prime with least primitive root 11 is 643, and the smallest prime with least primitive root 2, 3, 5, ..., 10 are all < 643, so 11 is a term. %e A318239 The smallest prime with least primitive root 45 is 95525767, and the smallest prime with least primitive root 2, 3, 5, ..., 44 are all < 95525767, so 45 is a term. %e A318239 13 is not a term since the smallest prime with least primitive root 13 is 457, but the smallest prime with least primitive root 12 is 4111, which is larger than 457. %Y A318239 Cf. A023048, A133433. %K A318239 nonn,hard,more %O A318239 1,1 %A A318239 _Jianing Song_, Aug 22 2018