diff --git a/tools/int_seq.py b/tools/int_seq.py
index 92b5250..3e00b20 100644
--- a/tools/int_seq.py
+++ b/tools/int_seq.py
@@ -35,4 +35,4 @@ def pentagonal(n: int) -> int:
     A pentagonal number is a figurate number that extends the concept of triangular and square numbers to the pentagon
     0, 1, 5, 12, 22, 35, ...
     """
-    return ((3 * n * n) - n) / 2
+    return ((3 * n * n) - n) // 2