Prime numbers less than 18 are: 2 3 5 7 11 13 and 17
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(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.
47 is the greatest prime number less than 48.
The lowest prime number that is less than 37 is 29.
The greatest prime number less than 200 is 199.
The largest prime number less than 50 is 47.