perplexus.info :: Sequences : Sequence 3

Home > Numbers > Sequences

Sequence 3 (Posted on 2003-08-08)

What is the next number in the following series :

5, 20, 24, 6, 2, 8, ?

See The Solution Submitted by Ravi Raja

Rating: 1.4444 (9 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

Solution

| Comment 8 of 13 |

Agreed answer is 12, Recursive formula for all n> 1: If Mod(n,4)=0 then t(n)=t(n-1)/4; If Mod(n-1,4)=0 then t(n)=t(n-1)-4; If Mod(n-2,4)=0 then t(n)=t(n-1)*4; If Mod(n-3,4)=0 then t(n)=t(n-1)+4.

Posted by Mr. Spock on 2003-08-09 13:58:01

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 (12)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info