2 6 10 and 26 are all prime numbers.
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13 is a prime number in that range. So are 11, 17 and 19.
2+11+13
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
The sum of the prime numbers greater then 2 and less than 12 equals 26
3 and 23 are two prime numbers having a sum of 26.