Find the wrong term in the following number series?13, 16, 21, 27, 39, 52, 69

The pattern of the given series is:

→ 13,

→ 13 + 3 = 16,

→ 16 + 5 = 21,

→ 21 + 7 = 28

So here wrong term is 27, pattern of the series is addition of prime number.

→ 28 + 11 = 39,

→ 39 + 13 = 52,

→ 52 + 17 = 69

13,16,21,27,39,52,69
16-13=3,21-16=5,27-21=6,39-27=12,52-39=13,69-52=17.
clearly we can see before 27 and after 39 , no.s added are prime no.s.
so if we proceed by the sequence the next prime no that is added is 7. so the series becomes:
13,16,21,28,39,52,69.
now the difference is pure prime no.s i.e. : 3,5,7,11,13,17.