1 

     2 

     3 assert(collatz_max(10) == (9, 20))

     4 

     5 assert(collatz_max(100) == (97, 119))

     6 

     7 assert(collatz_max(1000) == (871, 179))

     8 

     9 assert(collatz_max(10000) == (6171, 262))

    10 

    11 assert(collatz_max(100000) == (77031, 351))

    12 

    13 assert(collatz_max(1000000) == (837799, 525))