2 3 5 7 11 13 17.
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The set of prime numbers less than 20 = {2, 3, 5, 7, 11, 13, 17,19}
The set of counting numbers greater than one.
The set of natural numbers less than four is {1, 2, 3}.
90, 91, 92, 93, 94, 95, 96That's the only set of seven consecutive composite numbers less than 100.
set of all even natural numbers less than 10 = {2, 4, 6, 8}