Avoiding DIVIS in Number Theory

Description:Because the built-in DIVIS command can be slow, this has six commands useful in number theory that avoid using it: τ (how many divisors does X have?), σ (the sum of ALL the divisors of X), σ0 (the sum of the PROPER divisors of X), Ad (algebraic mean of the divisors of X), Hd (harmonic mean of the divisors of X), and Πd (product of all the divisors of X).
Author:Joseph K. Horn: http://HolyJoe.Org
Downloaded file size:2,170 bytes
Size on calculator:1 KB
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Primary category:Math/Symbolic
File date:2017-08-20 21:13:35
Creation date:2010-08-05
Source code:Included
Download count:379
Version history:2017-08-20: Added to site
Archive contents:
  Length      Date    Time    Name
---------  ---------- -----   ----
      339  2017-08-20 21:11   DIVIS.DIR
     5832  2017-08-20 21:12   divis.html
---------                     -------
     6171                     2 files
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