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primeFactors javascript Code Snippet in 2024

mathalgorithmbeginner

Last Updated: 15 February 2024

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) { a.push(f); n /= f; } else { f++; } } return a; };
primeFactors(147); // [3, 7, 7]

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