Editing Harmonic divisor number (section)

== References ==
{{portal|Mathematics}}
*{{cite web
  | author = Bogomolny, Alexander
  | title = An Identity Concerning Averages of Divisors of a Given Integer
  | url = http://www.cut-the-knot.org/proofs/average.shtml
  | access-date = 2006-09-10| author-link = Alexander Bogomolny
 }}
*{{cite journal
  | last = Cohen | first = Graeme L.
  | url =https://www.ams.org/mcom/1997-66-218/S0025-5718-97-00819-3/S0025-5718-97-00819-3.pdf
  | title = Numbers Whose Positive Divisors Have Small Integral Harmonic Mean
  | journal = [[Mathematics of Computation]]
  | volume = 66
  | pages = 883–891
  | year = 1997
  | doi = 10.1090/S0025-5718-97-00819-3
  | issue = 218
  | doi-access = free
  }}
*{{cite journal
  | last1=Cohen
  | first1=Graeme L.
  | last2=Sorli
  | first2=Ronald M.
  | year=2010
  | pages=2451
  | title=Odd harmonic numbers exceed 10<sup>24</sup>
  | volume=79
  | doi= 10.1090/S0025-5718-10-02337-9
  | journal=Mathematics of Computation
  | issn=0025-5718
  | issue=272
  | doi-access=free
  | hdl=10453/13014
  | hdl-access=free
  }}
*{{cite web
  | author = Goto, Takeshi
  | url = http://www.ma.noda.tus.ac.jp/u/tg/harmonic-e.html
  | title = (Ore's) Harmonic Numbers
  | access-date = 2006-09-10
  | archive-date = 2006-01-06
  | archive-url = https://web.archive.org/web/20060106230537/http://www.ma.noda.tus.ac.jp/u/tg/harmonic-e.html
  | url-status = dead
  }}
* {{cite book |last=Guy | first=Richard K. | author-link=Richard K. Guy | title=Unsolved problems in number theory | publisher=[[Springer-Verlag]] |edition=3rd | year=2004 |isbn=978-0-387-20860-2 | zbl=1058.11001 | at=B2 }}
*{{cite journal
  | title = On Divisors of Odd Perfect Numbers
  | author = Muskat, Joseph B.
  | journal = Mathematics of Computation
  | volume = 20
  | issue = 93
  | year = 1966
  | pages = 141–144
  | doi = 10.2307/2004277
  | jstor = 2004277| doi-access = free
  }}
*{{cite journal
  | author = Ore, Øystein
  | author-link = Øystein Ore
  | title = On the averages of the divisors of a number
  | journal = [[American Mathematical Monthly]]
  | volume = 55
  | year = 1948
  | pages = 615–619
  | doi = 10.2307/2305616
  | issue = 10
  | jstor = 2305616}}
* {{MathWorld |title=Harmonic Divisor Number |urlname=HarmonicDivisorNumber}}

{{Divisor classes}}
{{Classes of natural numbers}}

[[Category:Divisor function]]
[[Category:Integer sequences]]
[[Category:Number theory]]
[[Category:Perfect numbers]]