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<script src="http://www.javascripter.net/math/primes/BigInt.js"></script> <script> // A better random function Math.random = function() { var buf = new Uint32Array(1); crypto.getRandomValues(buf); return buf[0] / 0x100000000; } // Generate probable primes. // Probability that they are not prime is extremely low: 2^-80 for (var i=1; i<=5; i++) { var b = bigInt2str(randProbPrime(512), 10); document.write(i + ') ' + b + '<br>'); } </script>