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Least primitive root of n-th Mersenne prime.
1

%I #15 Feb 08 2024 01:49:37

%S 2,3,3,3,17,3,3,7,37,3,3,43,3,5,5,3,3,23,3,7

%N Least primitive root of n-th Mersenne prime.

%H Joerg Arndt, <a href="http://www.jjj.de/fxt/#fxtbook">Matters Computational (The Fxtbook)</a>

%H GIMPS, <a href="http://mersenne.org/">Great Internet Mersenne Prime Search</a>

%H S. S. Wagstaff, Jr., <a href="http://www.cerias.purdue.edu/homes/ssw/cun/index.html">The Cunningham Project</a>

%e a(5)=17 because 17 is the least primitive root of the 5th Mersenne prime, 8191.

%Y Cf. A000668, A000043.

%K hard,more,nonn

%O 1,1

%A _Ken Takusagawa_, Aug 05 2004

%E a(16), a(18)-a(20) from _Max Alekseyev_, Feb 07 2024