Question

How to calculate the Nth prime number in JavaScript

Answer 1

// 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73

function getTheNthPrimeNumber(nth) {
    let prime = 1, count = 0, i;

    while (count < nth) {
        prime += 1;
        for (i = 2; i <= prime; i++) {
            if (prime % i === 0) {
                break;
            }
        }
        if (i === prime) {
            count += 1;
        }
    }

    return prime;
}

const nth = 8;

console.log("Nth prime: " + getTheNthPrimeNumber(nth));


/*
run:

Nth prime: 19

*/

 

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