diff --git a/main.go b/main.go
index b3f7828..58f4999 100644
--- a/main.go
+++ b/main.go
@@ -89,7 +89,7 @@ func generatePrimesCPU(upperLimit int64, primes []int64, numRoutines int, progre
 
 	fmt.Printf("Calculating with %d routines\n\n", numRoutines)
 
-	for i := (primes[len(primes) - 1] + 1); i <= upperLimit; i++ {
+	for i := (primes[len(primes) - 1] + 2); i <= upperLimit; i += 2 {
 		select {
 		case progress <- calculateProgress(6, upperLimit, 1, i):
 		default:
diff --git a/tensor.go b/tensor.go
index 4948101..d1a2671 100644
--- a/tensor.go
+++ b/tensor.go
@@ -26,7 +26,7 @@ func generatePrimesGPU(upperLimit int64, primes []int64, progress chan float32)
 
 	fmt.Printf("Calculating with tensorflow\n\n")
 
-	for i := (primes[len(primes) - 1] + 1); i <= upperLimit; i++ {
+	for i := (primes[len(primes) - 1] + 2); i <= upperLimit; i += 2 {
 		select {
 		case progress <- calculateProgress(6, upperLimit, 1, i):
 		default: