As the range increases, the chances of covering all numbers in the range decreases (sampling range random numbers in range). – AMADANON Inc. Jan 8 '15 at 1:52 Having done some hunting, a very bad case scenario is choosing p=437699411, and q=p+1475; in that range of numbers, there is only one prime (and 1475 non-primes).

Prime number in Java: Prime number is a number that is greater than 1 and divided by 1 or itself only. In other words, prime numbers can't be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17.. are the prime numbers.

Note: 0 and 1 are not prime numbers. The 2 is the only even prime number because all the other even numbers can be divided by 2.

Let's see the prime number program in java. In this java program, we will take a number variable and check whether the number is prime or not.

Output:

Prime Number Program using Method in Java

Output:

Prime Number Program in Java (Another way)

You can also use a method where number is not predefined. Here, user has to put the number to check if the number is prime.

Output:

Find prime numbers between two numbers

You can also find prime numbers between two specified numbers.

Output:

Description

The randseed function produces random prime numbers that work well as seeds for random source blocks or noisy channel blocks in Communications Toolbox™ software.

Note

The randseed function uses a local stream of numbers that is independent from the global stream of numbers in the MATLAB^® software. Use of this function does not affect the state of the global random number stream.

out = randseed generates a random prime number between 31 and 2¹⁷-1, using the MATLAB function rand.

out = randseed(state) generates a random prime number after setting the state of rand to the positive integer state. This syntax produces the same output for a particular value of state.

out = randseed(state,m) generates a column vector of m random primes.

out = randseed(state,m,n) generates an m-by-n matrix of random primes.

out = randseed(state,m,n,rmin) generates an m-by-n matrix of random primes between rmin and 2¹⁷-1.

out = randseed(state,m,n,rmin,rmax) generates an m-by-n matrix of random primes between rmin and rmax.

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