Six: 1 3 5 9 15 45.
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The numbers that go into 45 are 1, 5, 9, 45
1, 3, 9.
There are 45 such numbers.
1,3,5,9,15,45
9,5
1,3,5,9,15,45
About 13million,
They are: 1 and 9
1 and 5.
3 and 5
Any 6 from 45 = 814506045C6 = 8145060
There are 45 such numbers.