Prime factors of number

Isabelle Viktoria Maciohsek · JavaScript, Math, Algorithm · Dec 28, 2020

Finds the prime factors of a given number using the trial division algorithm.

  • Use a while loop to iterate over all possible prime factors, starting with 2.
  • If the current factor, f, exactly divides n, add f to the factors array and divide n by f. Otherwise, increment f by one.
const primeFactors = n => {
  let a = [],
    f = 2;
  while (n > 1) {
    if (n % f === 0) {
      n /= f;
    } else {
  return a;
primeFactors(147); // [3, 7, 7]

Would you like to help us improve 30 seconds of code?Take a quick survey

Recommended snippets

  • Generates primes up to a given number, using the Sieve of Eratosthenes.

  • Luhn check

    JavaScript, Math

    Implements the Luhn Algorithm, used to validate a variety of identification numbers.

  • Arithmetic progression

    JavaScript, Math

    Creates an array of numbers in the arithmetic progression, starting with the given positive integer and up to the specified limit.