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Task/Semiprime/C/semiprime.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int semiprime(int n)
+{
+	int p, f = 0;
+	for (p = 2; f < 2 && p*p <= n; p++)
+		while (0 == n % p)
+			n /= p, f++;
+
+	return f + (n > 1) == 2;
+}
+
+int main(void)
+{
+	int i;
+	for (i = 2; i < 100; i++)
+		if (semiprime(i)) printf(" %d", i);
+	putchar('\n');
+
+	return 0;
+}