isPrime {blocksdesign}

Prime number test

Description

Tests if a given number is prime and returns TRUE or FALSE

Usage

isPrime(v)

Arguments

v

the number to be tested for primality

Details

Tests for the primality of any positive integer using the fact that all primes except 2 and 3 can be expressed as 6k-1 or 6k+1 for integer k.

Value

logical TRUE or FALSE

Examples

isPrime(731563)
isPrime(7315631)
isPrime(31**2)