A096393 Least primitive root of n-th Mersenne prime.

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

Offset: 1

Author

Ken Takusagawa, Aug 05 2004

Keywords

• hard
• more
• nonn

Examples

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

Links

• Joerg Arndt, Matters Computational (The Fxtbook)
• GIMPS, Great Internet Mersenne Prime Search
• S. S. Wagstaff, Jr., The Cunningham Project

Crossrefs

Cf. A000668, A000043.

Extensions

a(16), a(18)-a(20) from Max Alekseyev, Feb 07 2024