random generator optimization for primes

helper.c

@@ -2,7 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-uint32_t rand32() { return (rand() << 16) | (rand() & 0xFFFF); }
+uint32_t rand32() { return (rand() << 16) | (rand() & 0xFFFF) | 1; }
 
 void print_uint128(unsigned __int128 n) {
     if (n == 0) {
@@ -32,6 +32,9 @@ uint64_t rand64() {
     for (int i = 0; i < 4; i++) {
         r = (r << 16) | (rand() & 0xFFFF);
     }
+
+    // Force the bottom bit to 1, this will make all generated primes odd
+    r = r | 1;
     return r;
 }