From 8ba7fc52e13f6b1e270c6ea4da087956bcdb6d20 Mon Sep 17 00:00:00 2001
From: Pranav M S Krishnan <pranavmskrishnan@gmail.com>
Date: Fri, 17 Oct 2025 21:20:15 +0530
Subject: [PATCH 1/2] Add Armstrong number check algorithm

Implement function to check Armstrong numbers with examples.
---
 maths/armstrong_number.py | 40 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 maths/armstrong_number.py

diff --git a/maths/armstrong_number.py b/maths/armstrong_number.py
new file mode 100644
index 000000000000..e1850ff95ddd
--- /dev/null
+++ b/maths/armstrong_number.py
@@ -0,0 +1,40 @@
+from typing import Union
+
+def is_armstrong_number(n: int) -> bool:
+    """
+    Check whether a non-negative integer is an Armstrong (narcissistic) number.
+
+    An Armstrong number is a number that is the sum of its own digits each raised
+    to the power of the number of digits in the number.
+
+    Reference:
+        Narcissistic number (Armstrong number) — Wikipedia
+        https://en.wikipedia.org/wiki/Narcissistic_number
+
+    >>> is_armstrong_number(0)
+    True
+    >>> is_armstrong_number(1)
+    True
+    >>> is_armstrong_number(153)
+    True
+    >>> is_armstrong_number(370)
+    True
+    >>> is_armstrong_number(9474)
+    True
+    >>> is_armstrong_number(9475)
+    False
+    >>> is_armstrong_number(-1)  # negative numbers are not considered Armstrong
+    False
+    """
+    # Only non-negative integers are considered
+    if n < 0:
+        return False
+
+    # Convert to string to count digits
+    digits = str(n)
+    power = len(digits)
+
+    # Sum of each digit raised to the 'power'
+    total = sum(int(d) ** power for d in digits)
+
+    return total == n  

From 6ca69acf22a3b246f795e5900db4c5bbe74beaa3 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Fri, 17 Oct 2025 15:54:19 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 maths/armstrong_number.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/maths/armstrong_number.py b/maths/armstrong_number.py
index e1850ff95ddd..5e3170529941 100644
--- a/maths/armstrong_number.py
+++ b/maths/armstrong_number.py
@@ -1,5 +1,6 @@
 from typing import Union
 
+
 def is_armstrong_number(n: int) -> bool:
     """
     Check whether a non-negative integer is an Armstrong (narcissistic) number.
@@ -37,4 +38,4 @@ def is_armstrong_number(n: int) -> bool:
     # Sum of each digit raised to the 'power'
     total = sum(int(d) ** power for d in digits)
 
-    return total == n  
+    return total == n