diff --git a/cmd/pell.go b/cmd/pell.go
index ca92fbe..8eeb85e 100644
--- a/cmd/pell.go
+++ b/cmd/pell.go
@@ -26,6 +26,16 @@ import (
 
 var pellCoeff string
 
+func isPellSolution(h, k, d *big.Int) bool {
+	foo := new(big.Int).Exp(k, big.NewInt(2), nil)
+	foo.Mul(d, foo)
+
+	bar := new(big.Int).Exp(h, big.NewInt(2), nil)
+	bar.Sub(bar, foo)
+
+	return bar.Cmp(big.NewInt(1)) == 0
+}
+
 func pell(cmd *cobra.Command, args []string) {
 	d, ok := new(big.Int).SetString(pellCoeff, 10)
 	if !ok {
@@ -44,13 +54,7 @@ func pell(cmd *cobra.Command, args []string) {
 
 	for {
 		h, k := <-hch, <-kch
-		foo := new(big.Int).Exp(k, big.NewInt(2), nil)
-		foo.Mul(d, foo)
-
-		bar := new(big.Int).Exp(h, big.NewInt(2), nil)
-		bar.Sub(bar, foo)
-
-		if bar.Cmp(big.NewInt(1)) == 0 {
+		if isPellSolution(h, k, d) {
 			fmt.Println(h, k)
 		}
 	}