All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers > Sequences
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)

Comments: ( Back to comment list | You must be logged in to post comments.)
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
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2021 by Animus Pactum Consulting. All rights reserved. Privacy Information