primes function

Is there a way to use the prime function to find the prime numbers between two numbers? I want to find the prime numbers between 20,000 and 10,000 and save that to a variable. primes(20000) gives me them all the way to zero and if i try to subtract primes(20000) and primes(10000) it won't let me because there not the same size. Any ideas? Thanks.

[Jack Garvey]

1.) make array of range: range = [10000:1:20000]

2.) create logical array of (range) displaying which numbers are prime: isprime(range)

3.) find total amount of prime numbers within that range: number_of_primes = sum(isprime(range))

4.) i got the answer of 1033 prime numbers between 10K and 20K

Answer 1

[Walter Roberson]

setdiff(primes(20000),primes(10000))

Answer 2

[Andrei Bobrov]

k = 1e4:2e4;
out  = k(isprime(k));

variant

prms = primes(20000);
out = prms(prms>=10000);