Eberhart's Conjecture
If 
is the 
th prime such that 
is a Mersenne Prime, then
It was modified by Wagstaff (1983) to yield
where
is the Euler-Mascheroni Constant.
References
Ribenboim, P. The Book of Prime Number Records, 2nd ed. New York: Springer-Verlag, pp. 332-333, 1989. Wagstaff, S. S. ``Divisors of Mersenne Numbers.'' Math. Comput. 40, 385-397, 1983.
- Epicycloid--1-Cusped
- Epicycloid--2-Cusped
- Epicycloid Evolute
- Epicycloid Involute
- Epicycloid Pedal Curve
- Epicycloid Radial Curve
- Epimenides Paradox
- Epimorphism
- Epispiral
- Epispiral Inverse Curve
- Epitrochoid
- Epitrochoid Evolute
- Epsilon
- Epsilon-Neighborhood
- Epstein Zeta Function
- Equal
- Equal by Definition
- Equal Detour Point
- Equality
- Equally Likely Outcomes Distribution
- Equal Parallelians Point
- Equiaffinity
- Equiangular Spiral
- Equianharmonic Case
- Equi-Brocard Center