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-rw-r--r--common.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/common.h b/common.h
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index 0000000..10b298e
--- /dev/null
+++ b/common.h
@@ -0,0 +1,9 @@
+#ifndef COMMON_H
+#define COMMON_H
+
+unsigned long* primes(unsigned long limit);
+int isprime(unsigned long number, const unsigned long* primes);
+unsigned long phi(unsigned long n, unsigned long* primelist);
+int ispermutation(unsigned long a, unsigned long b);
+
+#endif // COMMON_H