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Task/Pernicious-numbers/C/pernicious-numbers.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+typedef unsigned uint;
+uint is_pern(uint n)
+{
+        uint c = 2693408940u; // int with all prime-th bits set
+        while (n) c >>= 1, n &= (n - 1); // take out lowerest set bit one by one
+        return c & 1;
+}
+
+int main(void)
+{
+        uint i, c;
+        for (i = c = 0; c < 25; i++)
+                if (is_pern(i))
+                        printf("%u ", i), ++c;
+        putchar('\n');
+
+        for (i = 888888877u; i <= 888888888u; i++)
+                if (is_pern(i))
+                        printf("%u ", i);
+        putchar('\n');
+
+        return 0;
+}