primes.js

#!/usr/bin/env node

function primeNumbers(n) {
  arr = [];
  for (var i = 2; arr.length < n; i++) {
    var is_div = false;
    for (var count = 2; count < i; count++) {
      if (i % count === 0) {
        is_div = true;
        break;
      }
    }
    if (is_div == false) {arr.push(i);}
  }
  return arr;
}

var k=100;
var res=primeNumbers(k);
// console.log(res);

var fs = require('fs');
var outfile = "primes.txt";
var out = res.join(",")
fs.writeFileSync(outfile, out);
console.log("Script: " + __filename + "\nWrote: " + out + " To: " + outfile);