Static hostname: starker-HYM-WXX

       Icon name: computer-laptop
         Chassis: laptop
      Machine ID: 9f936e1bf87b4e7cb0e53e5422bcaf22
         Boot ID: 7f7f08a039ed40d2b473aed355f1e17b
Operating System: Ubuntu 22.04.2 LTS
          Kernel: Linux 5.19.0-45-generic
    Architecture: x86-64
 Hardware Vendor: HONOR
  Hardware Model: HYM-WXX
 10:29:48 up 26 min,  1 user,  load average: 1.38, 1.19, 0.82

perftune/sieve.c

@@ -18,7 +18,7 @@ int *sieve(int n) {
     is_prime[j] = false;
 
   for (int i = 3; i <= n; i+=2) {
-    if(!is_prime[i]) continue;  //use prime only
+    if(is_prime[i]) continue;  //use prime only
     for (int j = i + i + i; j <= n; j += (i+i)) {
       is_prime[j] = false;
     }