e-Perfect Number
A number 
is called an 
-perfect number if 
, where 
is the Sum of thee-Divisor of . If 
is Squarefree, then 
. As a result, if is -perfect and is Squarefree with 
, then 
is -perfect. There are no Odd -perfectnumbers.
References
Guy, R. K. ``Exponential-Perfect Numbers.'' §B17 in Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, p. 73, 1994. Subbarao, M. V. and Suryanarayan, D. ``Exponential Perfect and Unitary Perfect Numbers.'' Not. Amer. Math. Soc. 18, 798, 1971.
- Zollner's Illusion
- Zonal Harmonic
- Zone
- Zonohedron
- Zonotype
- Zorn's Lemma
- z-Score
- Zsigmondy Theorem
- Z-Transform
- z-Transform
- z-Transform (Population)
- Embeddable Knot
- Embedding
- Empty Set
- e-Multiperfect Number
- Enantiomer
- Enantiomorph
- Encoding
- Endogenous Variable
- Endomorphism
- Endraß Octic
- Energy
- En-Function
- Engel's Theorem
- Enneacontagon