diff --git a/src/main.rs b/src/main.rs
index 45f4409..3012f98 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,17 +5,17 @@ fn sqrtu64(x: u64) -> u64 {
 }
 
 fn main() {
+    println!("Enter a number");
     let mut input_line = String::new();
     io::stdin()
         .read_line(&mut input_line)
         .expect("Failed to read line");
 
     let x: u64 = input_line.trim().parse().expect("Input not an integer");
-    let sqrtx = sqrtu64(x);
     let mut primes = vec![2,3,5,7];
     let mut i: u64 = 12;
 
-    while i <= sqrtx {
+    while i < x {
         let n = i-1;
         let m = i+1;
         let sqrtm = sqrtu64(m);