1 files changed, 35 insertions, 0 deletions
diff --git a/c/012-highly_divisible_triangular_number.c b/c/012-highly_divisible_triangular_number.c
new file mode 100644
index 0000000..4ece373
--- /dev/null
+++ b/c/012-highly_divisible_triangular_number.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <math.h>
+
+
+int triangle_number(int nb)
+{
+    int i, sum = 0;
+    for (i = 0; i < nb + 1; i++)
+        sum += i;
+    return sum;
+}
+
+int count_divisors(int nb)
+{
+    int i, div_nb = 0;
+    for (i = 1; i <= sqrt(nb); i++) {
+        if (nb % i == 0)
+            div_nb += (i != nb / i ? 2 : 1);
+    }
+    return div_nb;
+}
+
+int main(void)
+{
+    int i, t_nb;
+
+    for (i = 0;; i++) {
+        t_nb = triangle_number(i);
+        if (count_divisors(t_nb) + 2 > 500)
+            break;
+    }
+    printf("%d", t_nb);
+
+    return 0;
+}