random-prime

Generate (or check for) a random prime number

This uses Math.random internally.

Install

npm i random-prime --save

or

yarn add random-prime

Example

const randomPrime = require('random-prime').randomPrime

console.log(randomPrime())
// 254205915209711
console.log(randomPrime({ max: 500 }))
// 119
console.log(randomPrime({ min: 200, max: 800 }))
// 413

API

randomPrime()

Generate a random prime number from 0 to Number.MAX_SAFE_INTEGER.

Returns a prime number

randomPrime(max)

Generate a random prime number from 0 to max.

Returns a prime number or null if max < 2 Throws TypeError if max is not a Number

randomPrime(min, max)

Generate a random prime number from min to max.

Returns a prime number or null if there is no prime number between min and max Throws TypeError if min and/or max is not a Number

isPrime(num)

An efficient method to check if a number is prime.

Returns true if num is prime, false if num is not prime. Throws TypeError if the input is not a Number

Example

const isPrime = require('random-prime').isPrime

console.log(isPrime(2))
// true
console.log(isPrime(32416190079))
// true
console.log(isPrime(254205915209711))
// false
console.log(isPrime(500))
// false
console.log(isPrime(-10))
// false
console.log(isPrime(137))
// true

eachPrime([num])

An efficient method to check if every numbers in a list is prime.

Returns true if all items in list are prime, false otherwise. Throws TypeError if the input is not of type Array or is an empty array

Example

const eachPrime = require('random-prime').eachPrime

console.log(eachPrime([2, 19, 83, 47]))
// true
console.log(eachPrime([32416190079, 13, 23]))
// true
console.log(eachPrime([500, 1000, 2000]))
// false
console.log(eachPrime([2, 3, -10]))
// false