Editing Semiperfect number (section)

== References ==
* {{cite journal
 |title       = Sums of divisors and Egyptian fractions
 |last        = Friedman
 |first       = Charles N.
 |journal     = [[Journal of Number Theory]]
 |year        = 1993
 |volume      = 44
 |pages       = 328–339
 |mr          = 1233293
 |zbl         = 0781.11015
 |doi         = 10.1006/jnth.1993.1057
 |issue       = 3
 |doi-access= free
 }}
* {{cite book|last=Guy | first=Richard K. |author-link=Richard K. Guy|title=Unsolved Problems in Number Theory|publisher=[[Springer-Verlag]]|date=2004|isbn=0-387-20860-7|oclc=54611248 | zbl=1058.11001}} Section B2.
* {{ cite journal | last=Sierpiński | first=Wacław | author-link=Wacław Sierpiński | title=Sur les nombres pseudoparfaits | language=fr | journal=Mat. Vesn. |series=Nouvelle Série |volume=2 |issue=17 | pages=212–213 | year=1965 | zbl=0161.04402 | mr=199147 }}
* {{cite journal | zbl=0266.10012 | mr=360455 | last1=Zachariou | first1=Andreas | last2=Zachariou | first2=Eleni | title=Perfect, semiperfect and Ore numbers | journal=Bull. Soc. Math. Grèce |series=Nouvelle Série | volume=13 | pages=12–22 | year=1972 }}