1 

     2 

     3 assert(CW6a.collatz_max(10) == (20, 9))

     4 

     5 assert(CW6a.collatz_max(100) == (119, 97))

     6 

     7 assert(CW6a.collatz_max(1000) == (179, 871))

     8 

     9 assert(CW6a.collatz_max(10000) == (262, 6171))

    10 

    11 assert(CW6a.collatz_max(100000) == (351, 77031))

    12 

    13 assert(CW6a.collatz_max(1000000) == (525, 837799))