17 cause it is the next Prime number
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A series is a set of partial sums of sequences of numbers. A single number, such as 135, does cannot define a series.
10,11,13,14,15,17
the numbers are only dividable by 1 or themselves, the so called, 'prime numbers', so the next one would be 17.
10 the sequence is 3 numbers miss one, three numbers miss one, etc
Answer = 21 The next number is the previous 2 numbers added together