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 A219461 #20 Feb 08 2024 10:40:33 %S A219461 3,5,7,17,19,89,107,521,2203,2281,4253 %N A219461 Primes p such that 2^p - 1 is a prime with primitive root 3. %C A219461 If A096393(n) = 3, then A000043(n) belongs to this sequence. %C A219461 2^a(n) - 1 is in A001123. %C A219461 a(12) >= 21701. - _Max Alekseyev_, Feb 08 2024 %H A219461 Discussion titled <a href="http://www.mersenneforum.org/showthread.php?t=5874">Conjecture about multiplicative order of 3 modulo a Mersenne prime</a>, (postings in mersenneforum.org), starting May 14 2006. %H A219461 <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a> %t A219461 Select[Prime@Range[98], PrimitiveRoot[2^# - 1] == 3 &] %Y A219461 Subsequence of A000043. %Y A219461 Cf. A001123, A096393. %K A219461 hard,more,nonn %O A219461 1,1 %A A219461 _Arkadiusz Wesolowski_, Nov 20 2012 %E A219461 a(9)-a(11) from _Max Alekseyev_, Feb 07 2024