If is the th prime such that is a Mersenne prime, then
It was modified by Wagstaff (1983) to yield Wagstaff's conjecture,
where is the Euler-Mascheroni constant.
If is the th prime such that is a Mersenne prime, then
It was modified by Wagstaff (1983) to yield Wagstaff's conjecture,
where is the Euler-Mascheroni constant.
Weisstein, Eric W. "Eberhart's Conjecture." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EberhartsConjecture.html