33 lines
734 B
JavaScript
33 lines
734 B
JavaScript
// This script uses the Sieve of Eratosthenes to calculate prime numbers.
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let now = timestamp();
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const MAX_NUMBER_TO_CHECK = 1_000_000; // 9592 primes <= 100000
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let prime_mask = [];
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prime_mask.pad(MAX_NUMBER_TO_CHECK + 1, true);
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prime_mask[0] = false;
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prime_mask[1] = false;
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let total_primes_found = 0;
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for p in 2..=MAX_NUMBER_TO_CHECK {
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if !prime_mask[p] { continue; }
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//print(p);
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total_primes_found += 1;
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for i in range(2 * p, MAX_NUMBER_TO_CHECK + 1, p) {
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prime_mask[i] = false;
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}
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}
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print(`Total ${total_primes_found} primes <= ${MAX_NUMBER_TO_CHECK}`);
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print(`Run time = ${now.elapsed} seconds.`);
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if total_primes_found != 78_498 {
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print("The answer is WRONG! Should be 78,498!");
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}
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