diff --git a/static/js/random_primes.js b/static/js/random_primes.js
index 7abf1bc..0e8a2ff 100644
--- a/static/js/random_primes.js
+++ b/static/js/random_primes.js
@@ -86,26 +86,20 @@ function generate_prime() {
     }
 }
 
-// gist.github.com/krzkaczor/0bdba0ee9555659ae5fe
-var fastModularExponentiation = function (a, b, n) {
-    a = a % n;
-    var result = 1n;
-    var x = a;
+function fastModularExponentiation(a, b, n) {
+    let res = 1n;
 
     while (b > 0n) {
-        var leastSignificantBit = b % 2n;
-        b >>= 1n;
-
-        if (leastSignificantBit === 1n) {
-            result = result * x;
-            result = result % n;
+        if (b % 2n === 1n) {
+            res = (res * a) % n;
         }
 
-        x = x * x;
-        x = x % n;
+        b >>= 1n;
+        a = (a * a) % n;
     }
-    return result;
-};
+
+    return res;
+}
 
 const SMALL_PRIMES = [
     2n,