prime-calc.ts

import {generatePrimes} from 'primes-generator';

// there are 1,270,607 primes in the first 20mln:
const iterator = generatePrimes({boost: 1_270_607});

let a, lastValue = 0, count = 0;
const start = Date.now();

do {
    a = iterator.next();
    if (a.done) {
        break;
    }
    count++;
    lastValue = a.value;
} while (true);

console.log(`Duration: ${Date.now() - start}, count: ${count}, last prime: ${lastValue}`);