diff --git a/Project-Euler/Problem7.js b/Project-Euler/Problem7.js
new file mode 100644
index 000000000..f68212512
--- /dev/null
+++ b/Project-Euler/Problem7.js
@@ -0,0 +1,31 @@
+// https://projecteuler.net/problem=7
+
+const num = 10001;
+
+let primes = [2,3,5,7,11,13];
+
+const calculatePrime = (num) => {
+  let count = primes.length;
+  let current = primes[count-1] + 1;
+  while (count < num) {
+    // go through each prime and see if divisible by the previous primes
+    let prime = false;
+    primes.some((n, i) => {
+      if (current % n !== 0) {
+        if (i === count-1) {
+          prime = true;
+        }
+      } else {
+        return true;
+      }
+    })
+    if (prime) {
+      primes.push(current);
+      count += 1;
+    }
+    current += 1;
+  }
+  return primes[num-1];
+}
+
+console.log(calculatePrime(num));
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