diff --git a/cmd/isprime.go b/cmd/isprime.go
index af07f16..283b86c 100644
--- a/cmd/isprime.go
+++ b/cmd/isprime.go
@@ -29,18 +29,14 @@ var rounds uint
 func isprime(cmd *cobra.Command, args []string) {
 	x := new(big.Int)
 
-	primes := make([]bool, len(args))
-	for i, s := range args {
+	for _, s := range args {
 		_, ok := x.SetString(s, 10)
 		if !ok {
-			log.Fatal("invalid input " + s)
+			log.Print("invalid input " + s)
+			continue
 		}
 
-		primes[i] = x.ProbablyPrime(int(rounds))
-	}
-
-	for _, b := range primes {
-		fmt.Println(b)
+		fmt.Println(x.ProbablyPrime(int(rounds)))
 	}
 }