Re: Number Theory Functions
- From: avkalb <avkalb bway net>
- To: Jean Bréfort <jean brefort normalesup org>
- Cc: gnumeric-list gnome org, avkalb <avkalb panix com>
- Subject: Re: Number Theory Functions
- Date: Wed, 17 Mar 2010 09:33:35 -0500
Now I understand. Thank you.
Jean Bréfort wrote:
15 has actually 4 divisors: 1, 3, 5 and 15. What's wrong there?
Le lundi 15 mars 2010 à 11:27 -0500, avkalb a écrit :
Using Gnumeric Spreadsheet 1.10.1 and 64-bit Sidux.
The Gnumeric Manual, Version 1.10, section A13 indicates some number theory
calculations are available. I have briefly examined a few:
Some functions give me reasonable outputs for simple test inputs:
Isprime, ithprime, nt_pi, nt_sigma, and pfactor.
But nt_d doesn't seem to work as I expected. nt_d(n) is supposed to
calculate the number of divisors of n
according to function reference A13 in The Gnumeric Manual, Version 1.10
If you select the insert function from the menu bar and then select nt_d
from the listing, an example is given
that nt_d(4096) = 13. In actuality, 2^12 = 4096 i.e there are 12
divisors of 2 in 4096. If 1 also is included
as a divisor then 13 would be correct.
But that doesn't explain the following results:
nt_d(15) = 4
nt_d(21) = 4
nt_d(70) = 8
though it would explain these:
n 7 11 31 16
nt_d(n) 2 2 2 5
What's wrong? Am I misinterpreting what the function is supposed to
do? Any suggestions?
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