[PD] prime numbers

[Mathieu Bouchard]

On Sun, 12 Sep 2010, Frank Barknecht wrote:
> On Sat, Sep 11, 2010 at 10:48:05PM +0100, Pedro Lopes wrote:
>> other way to go: you could grab them from a file (of stored primes) or from
>> an online prime generator =P
> Actually that's what I would do. And did, see attachment. The numbers come from
> http://primes.utm.edu/lists/small/1000.txt
> They are included twice to allow random and sequential access to the first 1000
> primes.

Also, because the 1000th prime is 7919 and because 7919*7919 = 62710561 >= 
16777216, then that list of primes is enough for anything you can do with 
pd's normal floats. It can even be said that you only would ever need the 
first 574 primes when using the float format to represent whole numbers : 
the 574th prime is the biggest prime you'll need to figure out that any 
bigger float is a prime number, up to the limit where whole odd floats 
stop to exist. It's because it's the last prime before 4096, and 
4096*4096 = the limit itself.

  _______________________________________________________________________
| Mathieu Bouchard ------------------------------ Villeray, Montréal, QC