It is 23
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47 is the greatest prime number less than 48.
The greatest prime number less than 200 is 199.
The smallest prime number is 2 and the greatest prime number less than 100 is 97. The required product is: 2 x 97 = 194.
The greatest prime number less than 20 is 19. For there to be a difference, we'll have to have another value.
23