23 and 29
as
20 = 2 x 10
21 = 3 x 7
22 = 2 x 11
23 = prime
24 = 4 x 6
25 = 5 x 5
26 = 2 x 13
27 = 3 x 9
28 = 2 x 14
29 = prime
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40, for example. Any number that is a whole number of twenties.
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503 is a prime number.