Problem 014.

.gitignore

@@ -57,4 +57,5 @@ docs/_build/
 target/
 
 # Visual Studio
-*.suo
+*.suo
+*.user

014.py

@@ -0,0 +1,34 @@
+# ----------------------------------
+# Project Euler - projecteuler.net
+# ----------------------------------
+# Developed by Felipe B Oriani
+# 014 - Longest Collatz sequence
+# Which starting number, under one million, produces the longest chain?
+# ----------------------------------
+
+def collatz(n): 
+    i = 0
+    r = n
+    while r > 1:
+        if r % 2 == 0: 
+            r = int(r / 2)
+        else:
+            r = int(r*3 + 1)
+        i += 1
+    return [i, n]
+
+def f(n):
+    m = 0
+    maxStarting = 0
+    for starting in range(0, n):
+        c = collatz(starting) 
+        if c > m:
+            maxStarting = starting
+            m = c
+    return maxStarting
+
+anwser = f(10**6)
+
+#assert anwser == 233168
+
+print('Answer: ', anwser)

Euler.pyproj

@@ -6,7 +6,7 @@
     <ProjectGuid>da4d3d95-087f-4893-802b-0f173e243244</ProjectGuid>
     <ProjectHome>
     </ProjectHome>
-    <StartupFile>008.py</StartupFile>
+    <StartupFile>014.py</StartupFile>
     <SearchPath>
     </SearchPath>
     <WorkingDirectory>.</WorkingDirectory>
@@ -23,7 +23,7 @@
     <EnableUnmanagedDebugging>false</EnableUnmanagedDebugging>
   </PropertyGroup>
   <ItemGroup>
-    <Compile Include="011.py" />
+    <Compile Include="014.py" />
     <Compile Include="008.py" />
     <Compile Include="012.py" />
     <Compile Include="007.py" />