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45/3 = 15

15/3 = 5

5/5 = 1

45 = 3^2 x 5

.....45

3... x ..15

3....x 3 x 5

17/17 = 1

75/5 = 15

15/3 = 5

5/5 = 1

.....75

5....x......15

5....x..3...x....5

75 = 3 x 5^2

64/2 = 32

32/2 = 16

16/2 = 8

8/2 = 4

4/2 = 2

2/2 = 1

64 = 2^6

............64

......2.....x.......32

......2.....x....2...x.....16

......2.....x....2...x..2..x......8

......2.....x....2...x..2..x...2.x...4

......2.....x....2...x..2..x...2.x.2 x 2

63/3 = 21

21/3 = 7

7/7 = 1

........63

....3...x.....21

....3...x..3..x.....7

63 = 3^2 x 7

73/73 = 1