whole numbers would be 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20.
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All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
23 and 29 are the two prime numbers greater than 20 but less than 30.
All those not less than 20.
There are infinitely many whole numbers which are less than 20. Start with 19 and go back, beyond 0, to negative infinity.
The set of prime numbers less than 20 = {2, 3, 5, 7, 11, 13, 17,19}