Of that group, 19 and 37 are prime.
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The sum of 7 and 19 is 26.
19 + 5 + 2
3 + 23 = 26 also 7 + 19 = 26 also 13 + 13 = 26
Prime numbers: 11, 13, 17, 19, 23, 29 Composite numbers: 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30
13 is a prime number in that range. So are 11, 17 and 19.