From 95341b61b030c9e1290f3b326cb7ec584f543aea Mon Sep 17 00:00:00 2001
From: Reiner Herrmann <reiner@reiner-h.de>
Date: Sun, 31 Aug 2014 20:21:45 +0200
Subject: moved files to higher directory after split to new repository

---
 021.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 021.c

(limited to '021.c')

diff --git a/021.c b/021.c
new file mode 100644
index 0000000..e236cf3
--- /dev/null
+++ b/021.c
@@ -0,0 +1,35 @@
+#include <math.h>
+
+int sum_divisors(int number)
+{
+	int i;
+	int sum = 1;
+	int limit = (int) ceil(sqrt(number));
+	for(i=2; i<limit; i++)
+	{
+		if(number % i == 0)
+		{
+			sum += i;
+			if(number / i != i)
+				sum += number / i;
+		}
+	}
+	return sum;
+}
+
+int main()
+{
+	int sum = 0;
+	int a;
+	for(a=1; a<10000; a++)
+	{
+		int b = sum_divisors(a);
+		if(a == sum_divisors(b) && a != b)
+			sum += a;
+	}
+
+	printf("%d\n", sum);
+
+	return 0;
+}
+
-- 
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