PlanetMath (more info)
 Math for the people, by the people. Sponsor PlanetMath
Encyclopedia | Requests | Forums | Docs | Wiki | Random | RSS  
Login
create new user
name:
pass:
forget your password?
Main Menu
sections
Encyclopædia
Papers
Books
Expositions

meta
Requests (236)
Orphanage
Unclass'd (1)
Unproven (540)
Corrections (47)
Classification

talkback
Polls
Forums
Feedback
Bug Reports

downloads
Snapshots
PM Book

information
News
Docs
Wiki
ChangeLog
TODO List
Copyright
About
References to 'perfect number'
1. abundance by CompositeFan
2. abundant number by CompositeFan
3. aliquot sequence by PrimeFan
4. deficiency by PrimeFan
5. every even integer greater than 70 is the sum of two abundant numbers in more than one way by PrimeFan
6. examples of digital roots in a few selected bases by PrimeFan
7. examples supporting the Erd\H{o}s-Straus conjecture by PrimeFan
8. famous open questions in mathematics by rspuzio
9. four hundred ninety-six by CompositeFan
10. Great Internet Mersenne Prime Search by PrimeFan
11. history of prime numbers by Mathprof
12. hyperperfect number by CompositeFan
13. iterated totient function by CompositeFan
14. Judy Holdener by Mravinci
15. large integers that are or might be the smallest of their kind by Mravinci
16. Mersenne numbers by alozano
17. multiply perfect number by CompositeFan
18. number theory by olivierfouquetx
19. Ore number by CompositeFan
20. Pierre de Fermat by PrimeFan
21. power of two by 1and2and4
22. proper divisor by PrimeFan
23. quasiperfect number by CompositeFan
24. Rhind Mathematical Papyrus by milogardner
25. semiperfect number by CompositeFan
26. superperfect number by CompositeFan
27. table of Mersenne primes by PrimeFan
28. temporary index 3 of number theory topics by PrimeFan
29. theorem on multiples of abundant numbers by CompositeFan
30. top ten coolest numbers by rspuzio
31. unitary perfect number by CompositeFan
32. untouchable number by PrimeFan
33. world records in mathematics by PrimeFan