Unexpected token ILLEGAL(first 100 primes)

I'm running into the below errors and I'm not quite sure as to why. Bare in mind, I'm using Node.js. The goal is to output the first 100 prime numbers to a 'hello.txt' file. Please advise how to get this working! Thanks.

error msg:

return arr.join(“,”);
^
SyntaxError: Unexpected token ILLEGAL
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:901:3

first 100 primes code:

#!/usr/bin/env node

var prime = function (n) {
if (n === 2 || n === 3 || n === 5 || n === 7 || n === 11 || n === 13 || n === 17 || n === 19) {return n;}
if (n % 2 > 0 && n % 3 > 0 && n % 5 > 0 && n % 7 > 0 && n % 11 > 0 && n % 13 > 0 && n % 17 > 0 && n % 19 > 0 && n % Math.sqrt (n) > 0) {return n;}
};

var first100primes = function(k) {
var n = 1;
var arr = [];

for (n = 1; n < k+1; n++) {
arr.push(prime (n));
}
arr = arr.filter(Number);
arr.length=100;
return arr;
};

var fmt = function (arr) {
return arr.join(“,”);
};

var final = (fmt(first100primes(1000)));

var fs = require(‘fs’);
var outfile = “prime.txt”;
var out = final + “,”;
fs.writeFileSync(outfile, out);
console.log(“Script: ” + __filename + “\nWrote: ” + out + “To: ” + outfile);