16 of them.
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You can find lists of prime numbers online in many places. Just search Google for "list of prime numbers" or something similar.
As a product of its prime factors: 2*2*5*5*7 = 700
The prime factors of 700 are 2 x 2 x 5 x 5 x 7 (or 22 x 52 x 7)
As a product of its prime factors: 2*2*5*5*7 = 700
How many numbers less than 700 are divisible by both 15 and 21?