13 15 17 19 21 23 25 27 29 31
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11 and 31 and all the fives between numbers.
The prime numbers between 1 and 31 (inclusive) are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, and 31.
There are 11 prime numbers between 2 and 40: 3 5 7 11 13 17 19 23 29 31 37.
The numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 are prime (including the boundaries).
The prime numbers between 31 and 50 are 37,41,43,47.