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

Home > Numbers
What is the next number? (Posted on 2005-02-20) Difficulty: 3 of 5
What is the next number in the following series: 17 15 14 13 13 14 17 23 ?

See The Solution Submitted by Swastika Shrivastava    
Rating: 1.2500 (4 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Solution | Comment 7 of 12 |
Take second order differences like this:

17 -2 +1
15 -1 0
14 -1 +1
13 0 +1
13 +1 +2
14 +3 +3
17 +6
23

The last column looks like the Fibonacci sequence, but starting with 1 and 0 instead of 0 and 1. If we place +5 at the end of the third column, then at the end of the second column we should place a +11, and in the first column we'd get 34.
  Posted by e.g. on 2005-02-21 14:10:34
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (14)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information