The pattern seems to be 16^2 plus 29 = 285
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285
27 is not a prime number.
19 23 29 31 and so on. All prime numbers
A prime number is a number that is divisible only by 1 and itself; it has no other factors. The factors of 7 are 1 and 7. The factors of 13 are 1 and 13. The factors of 27 are 1, 3, 9, and 27. The factors of 29 are 1 and 29. Therefore, 27 is the only one that is not a prime number.
22