17 & 19... they're all prime numbers.
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29. The two consecutive numbers after 13 are 14 and 15.14 + 15 = 29
13-2 = 11
The quoted numbers are all PRIME Numbers. The next prime numbers after '11' are , 13 ,17,19,23,29,31,37,41,43,47, up to '50' Prime Numbers , like ordinary numbers, go to infinity. NB After '2' , there are no. even prime numbers. They are all ODD NUmbers.
11 and 13 are prime numbers but 15 is a composite number because it has more than two factors
They are 3, 5, 7, 11, and 13