There are 1061 four digit primes. Wrote a simple program to test primality of the numbers in range [1000,9999]. read more
Here are all the 3 digit prime numbers, i.e. all prime numbers between 101-1,000. All in all, there are 143 prime numbers from 101-1,000. This means that 143/900 or around 1 in 6 numbers from 101-1,000 are prime. 757 numbers are composite. read more