diff --git a/.travis.yml b/.travis.yml
index a3ff22fb0..bea512264 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,10 +18,6 @@ script:
       --ignore=machine_learning/perceptron.py
       --ignore=machine_learning/random_forest_classification/random_forest_classification.py
       --ignore=machine_learning/random_forest_regression/random_forest_regression.py
-      --ignore=maths/abs_min.py
-      --ignore=maths/binary_exponentiation.py
-      --ignore=maths/lucas_series.py
-      --ignore=maths/sieve_of_eratosthenes.py
 after_success:
   - python scripts/build_directory_md.py
   - cat DIRECTORY.md
diff --git a/maths/abs_min.py b/maths/abs_min.py
index d546196aa..abb0c9051 100644
--- a/maths/abs_min.py
+++ b/maths/abs_min.py
@@ -1,10 +1,11 @@
-from abs import abs_val
+from .abs import abs_val
+
 
 def absMin(x):
     """
-    # >>>absMin([0,5,1,11])
+    >>> absMin([0,5,1,11])
     0
-    # >>absMin([3,-10,-2])
+    >>> absMin([3,-10,-2])
     -2
     """
     j = x[0]
@@ -13,9 +14,11 @@ def absMin(x):
             j = i
     return j
 
+
 def main():
     a = [-3,-1,2,-11]
     print(absMin(a))  # = -1
 
+
 if __name__ == '__main__':
     main()
\ No newline at end of file
diff --git a/maths/binary_exponentiation.py b/maths/binary_exponentiation.py
index cf789afc6..a8d736adf 100644
--- a/maths/binary_exponentiation.py
+++ b/maths/binary_exponentiation.py
@@ -17,11 +17,12 @@ def binary_exponentiation(a, n):
         return b * b
 
 
-try:
-    BASE = int(input('Enter Base : '))
-    POWER = int(input("Enter Power : "))
-except ValueError:
-    print("Invalid literal for integer")
+if __name__ == "__main__":
+    try:
+        BASE = int(input("Enter Base : ").strip())
+        POWER = int(input("Enter Power : ").strip())
+    except ValueError:
+        print("Invalid literal for integer")
 
-RESULT = binary_exponentiation(BASE, POWER)
-print("{}^({}) : {}".format(BASE, POWER, RESULT))
+    RESULT = binary_exponentiation(BASE, POWER)
+    print("{}^({}) : {}".format(BASE, POWER, RESULT))
diff --git a/maths/lucas_series.py b/maths/lucas_series.py
index 91ea1ba72..9ae437dc9 100644
--- a/maths/lucas_series.py
+++ b/maths/lucas_series.py
@@ -1,13 +1,21 @@
 # Lucas Sequence Using Recursion
 
 def recur_luc(n):
-  if n == 1:
-    return n
-  if n == 0:
-    return 2
-  return (recur_luc(n-1) + recur_luc(n-2))
-    
-limit = int(input("How many terms to include in Lucas series:"))
-print("Lucas series:")
-for i in range(limit):
-  print(recur_luc(i))
+    """
+    >>> recur_luc(1)
+    1
+    >>> recur_luc(0)
+    2
+    """
+    if n == 1:
+        return n
+    if n == 0:
+        return 2
+    return recur_luc(n - 1) + recur_luc(n - 2)
+
+
+if __name__ == "__main__":
+    limit = int(input("How many terms to include in Lucas series:"))
+    print("Lucas series:")
+    for i in range(limit):
+        print(recur_luc(i))
diff --git a/maths/sieve_of_eratosthenes.py b/maths/sieve_of_eratosthenes.py
index 11c123693..cedd04f92 100644
--- a/maths/sieve_of_eratosthenes.py
+++ b/maths/sieve_of_eratosthenes.py
@@ -2,9 +2,6 @@
 
 import math
 
-N = int(input("Enter n: "))
-
-
 def sieve(n):
     """Sieve of Eratosthones."""
     l = [True] * (n + 1)
@@ -26,4 +23,5 @@ def sieve(n):
     return prime
 
 
-print(sieve(N))
+if __name__ == "__main__":
+    print(sieve(int(input("Enter n: ").strip())))