19 lines
448 B
Python
19 lines
448 B
Python
def collatz_to_one(n):
|
|
chainLength = 1
|
|
while (n > 1):
|
|
if n % 2 == 0:
|
|
n = n/2
|
|
else:
|
|
n = 3 * n + 1
|
|
chainLength += 1
|
|
return chainLength
|
|
|
|
longestChain = 0
|
|
|
|
for i in range(1000000):
|
|
currentChain = collatz_to_one(i)
|
|
if currentChain > longestChain:
|
|
longestChain = currentChain
|
|
print("current longest chain: " + str(longestChain) + " (from " + str(i) + ")")
|
|
|
|
print("done") |