diff --git a/Project Euler/Problem 3/problem3_sol1.rb b/Project Euler/Problem 3/problem3_sol1.rb
new file mode 100644
index 0000000..30a8bca
--- /dev/null
+++ b/Project Euler/Problem 3/problem3_sol1.rb	
@@ -0,0 +1,19 @@
+# The prime factors of 13195 are 5, 7, 13 and 29.
+# What is the largest prime factor of the number 600851475143 ?
+
+def solution(n)
+  prime = 1
+  i = 2
+  while i * i <= n
+    while (n % i).zero?
+      prime = i
+      n = n.fdiv i
+    end
+    i += 1
+  end
+  prime = n if n > 1
+  prime.to_i
+end
+
+puts solution(600851475143)
+