#! /usr/bin/env python3

import sys
import collatz

usage='usage: collatzSearch [digits] outputs the lenght of the collatz sequence for every number less than 10^digits'

if len(sys.argv)<2:
    print(usage)
    sys.exit()
digits = sys.argv[1]

try:
    digits = int(digits)
except:
    print(usage)
    sys.exit()

nextNumber = 1
maxNumber = 10**digits

while nextNumber<maxNumber:
    print('collatz length of '+str(nextNumber)+' is: \n'+str(collatz.seqenceLength(nextNumber)))
    nextNumber += 1