the prime numbers less than 10 are 2,3,5,and 7?
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The greatest prime number less than 20 is 19. For there to be a difference, we'll have to have another value.
It is: 97-2 = 95
59 - 2 = 57
47 is the greatest prime number less than 48.
The greatest prime number less than 200 is 199.