All are even. All are multiples of 6 except the first. They thin out faster than the primes. They are one off from being a prime. In both directions. Ah ha!
They are all the number between a pair of twin primes. I hope I don't have to look far to find the next pair. Oh good, the next twin primes are 107, 109. So the next number is 108.
Solution and thought process.
