diff --git a/DIRECTORY.md b/DIRECTORY.md
index eeea22e47..64a87dc66 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -112,6 +112,7 @@
   * [Cnn Classification](https://github.com/TheAlgorithms/Python/blob/master/computer_vision/cnn_classification.py)
   * [Flip Augmentation](https://github.com/TheAlgorithms/Python/blob/master/computer_vision/flip_augmentation.py)
   * [Harris Corner](https://github.com/TheAlgorithms/Python/blob/master/computer_vision/harris_corner.py)
+  * [Horn Schunck](https://github.com/TheAlgorithms/Python/blob/master/computer_vision/horn_schunck.py)
   * [Mean Threshold](https://github.com/TheAlgorithms/Python/blob/master/computer_vision/mean_threshold.py)
   * [Mosaic Augmentation](https://github.com/TheAlgorithms/Python/blob/master/computer_vision/mosaic_augmentation.py)
   * [Pooling Functions](https://github.com/TheAlgorithms/Python/blob/master/computer_vision/pooling_functions.py)
@@ -131,6 +132,7 @@
   * [Molecular Chemistry](https://github.com/TheAlgorithms/Python/blob/master/conversions/molecular_chemistry.py)
   * [Octal To Decimal](https://github.com/TheAlgorithms/Python/blob/master/conversions/octal_to_decimal.py)
   * [Prefix Conversions](https://github.com/TheAlgorithms/Python/blob/master/conversions/prefix_conversions.py)
+  * [Prefix Conversions String](https://github.com/TheAlgorithms/Python/blob/master/conversions/prefix_conversions_string.py)
   * [Pressure Conversions](https://github.com/TheAlgorithms/Python/blob/master/conversions/pressure_conversions.py)
   * [Rgb Hsv Conversion](https://github.com/TheAlgorithms/Python/blob/master/conversions/rgb_hsv_conversion.py)
   * [Roman Numerals](https://github.com/TheAlgorithms/Python/blob/master/conversions/roman_numerals.py)
@@ -529,6 +531,7 @@
   * [Perfect Square](https://github.com/TheAlgorithms/Python/blob/master/maths/perfect_square.py)
   * [Persistence](https://github.com/TheAlgorithms/Python/blob/master/maths/persistence.py)
   * [Pi Monte Carlo Estimation](https://github.com/TheAlgorithms/Python/blob/master/maths/pi_monte_carlo_estimation.py)
+  * [Points Are Collinear 3D](https://github.com/TheAlgorithms/Python/blob/master/maths/points_are_collinear_3d.py)
   * [Pollard Rho](https://github.com/TheAlgorithms/Python/blob/master/maths/pollard_rho.py)
   * [Polynomial Evaluation](https://github.com/TheAlgorithms/Python/blob/master/maths/polynomial_evaluation.py)
   * [Power Using Recursion](https://github.com/TheAlgorithms/Python/blob/master/maths/power_using_recursion.py)
@@ -619,6 +622,7 @@
   * [Tower Of Hanoi](https://github.com/TheAlgorithms/Python/blob/master/other/tower_of_hanoi.py)
 
 ## Physics
+  * [Horizontal Projectile Motion](https://github.com/TheAlgorithms/Python/blob/master/physics/horizontal_projectile_motion.py)
   * [N Body Simulation](https://github.com/TheAlgorithms/Python/blob/master/physics/n_body_simulation.py)
   * [Newtons Second Law Of Motion](https://github.com/TheAlgorithms/Python/blob/master/physics/newtons_second_law_of_motion.py)
 
@@ -833,6 +837,8 @@
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_101/sol1.py)
   * Problem 102
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_102/sol1.py)
+  * Problem 104
+    * [Sol](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_104/sol.py)
   * Problem 107
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_107/sol1.py)
   * Problem 109
@@ -857,6 +863,8 @@
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_135/sol1.py)
   * Problem 144
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_144/sol1.py)
+  * Problem 145
+    * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_145/sol1.py)
   * Problem 173
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_173/sol1.py)
   * Problem 174
@@ -990,6 +998,7 @@
   * [Manacher](https://github.com/TheAlgorithms/Python/blob/master/strings/manacher.py)
   * [Min Cost String Conversion](https://github.com/TheAlgorithms/Python/blob/master/strings/min_cost_string_conversion.py)
   * [Naive String Search](https://github.com/TheAlgorithms/Python/blob/master/strings/naive_string_search.py)
+  * [Ngram](https://github.com/TheAlgorithms/Python/blob/master/strings/ngram.py)
   * [Palindrome](https://github.com/TheAlgorithms/Python/blob/master/strings/palindrome.py)
   * [Prefix Function](https://github.com/TheAlgorithms/Python/blob/master/strings/prefix_function.py)
   * [Rabin Karp](https://github.com/TheAlgorithms/Python/blob/master/strings/rabin_karp.py)
diff --git a/project_euler/problem_145/sol1.py b/project_euler/problem_145/sol1.py
index 82e2ea79b..09d8daff5 100644
--- a/project_euler/problem_145/sol1.py
+++ b/project_euler/problem_145/sol1.py
@@ -23,10 +23,11 @@ def odd_digits(num: int) -> bool:
     >>> odd_digits(135797531)
     True
     """
-    num_str = str(num)
-    for i in ["0", "2", "4", "6", "8"]:
-        if i in num_str:
+    while num > 0:
+        digit = num % 10
+        if digit % 2 == 0:
             return False
+        num //= 10
     return True