Cary,

Jud is right. If my calculations are correct, the number of primes

between 2*10^19 and 3*10^19 is about 2*10^17. If a program could

generate

a million primes per second, it would still take 2*10^11 seconds, or

6000 years to generate them -- and a lot of storage.

Jud, what is the program you would use to generate a string of

consecutive 20-digit primes if you wanted say, 1000 or so of them?

Tom Hadley

-----Original Message-----

From: Jud McCranie [mailto:

j.mccranie@...]

Sent: Wednesday, December 31, 2003 12:36 PM

To: Cary Walker

Cc:

primenumbers@yahoogroups.com
Subject: Re: [PrimeNumbers] Prime generator

At 12:50 PM 12/31/2003, Cary Walker wrote:

I'm afraid this is going to be a trivial question for you: I am looking

for

>a program that will generate all the primes from ~2x10^19 to some large

>upper bound. ...

> Is there a program that will generate all the primes in a

>range?

Yes, but if that is your lower bound, unless the upper bound isn't much

larger it will take too long to generate all of the primes or you will

run

out of space to store them.

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