Importance: High ✭✭✭
 Author(s): Ancient/folklore
 Subject: Number Theory
 Keywords: perfect number
 Posted by: azi on: September 27th, 2008
Conjecture   There is no odd perfect number.

There is substantial literature on the problem. Most proceeds from a study of the multiplicative function where the conjecture can be stated: implies that is even.

## Bibliography

* indicates original appearance(s) of problem.