File size: 673 Bytes
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def solution(max):
s_len = 0
s_num = 0
lengths = []
for i in range(0, max):
length = 0
num = i
while num > 0:
length += 1
if num == 1:
break
if num % 2 == 0:
num = num / 2
else:
num = (3 * num) + 1
if num < len(lengths):
length += lengths[num]
num = 0
lengths.append(length)
if length > s_len:
s_len = length
s_num = i
print('n:%s\tlen:%s' % (s_num, s_len))
print(len(collatz(s_num)))
def collatz(start):
seq = []
num = start
while num > 0:
seq.append(num)
if num == 1:
break
if num % 2 == 0:
num = num / 2
else:
num = (3 * num) + 1
return seq
if __name__ == '__main__':
solution(1000000) |