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No primes here (Posted on 2015-11-30) Difficulty: 2 of 5
4, 6, 12, 18, 30, 42, 60, 72, 102,...

What is the next number in the above sequence?

No Solution Yet Submitted by Ady TZIDON    
Rating: 5.0000 (1 votes)

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Solution Solution and thought process. | Comment 1 of 2
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.

  Posted by Jer on 2015-11-30 16:58:09
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