They are members of the infinite set of numbers of the form 21*k where k is an integer.
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Some numbers that are divisible by 63 is 1,3,7,9, and 21.
Because 21 is divisible by numbers other than 1 and 21. 21 is divisible by 1, 3, 7, 21
How many numbers less than 700 are divisible by both 15 and 21?
No.
21 numbers - if you include the 10 and the 50.