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13, it's the only prime. All the other ones can be divided by something other than 1.
The two number have no common prime factors. i.e. the HCF(14, 15) = 1; they are coprime.
15
8 does not belongSequence is to add 1 for the first number, and double the next result, and then add 1 to that result, and double again...Correct Sequence2 (+1) 3 (x2) 6 (+1) 7 (x2) 14 (+1) 15 (x2) 302-3-6-7-8-14-15-30(2+1) = (3 x 2) = (6 + 1) = (7 x 2) = (14 + 1) = (15 x 2) = 30 ....So 8 does not belong in the above series.