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Lotsa Sequences! (Posted on 2003-10-26) Difficulty: 3 of 5
Here are a few sequences:

20,6,4,3,2,2,2 etc.
10,4,3,2,2,2etc.
16,5,2,2,2 etc.
60,12,6,4,3,2,2etc.

Each sequence follows the exact same rule and when it says 'etc.' the last digit is repeated an infinite number of times. (The first number in each sequence is random and does not follow the rule).

What is the rule for these sequences?

See The Solution Submitted by Lewis    
Rating: 3.7778 (9 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Puzzle Solution Comment 6 of 6 |

With the exception of the first term of each subsequence, the number of factors of any given number follows that number.

Thus, 12 is followed by 6, as 12 possesses six distinct factors:
1,2,3,4,6,12.


  Posted by K Sengupta on 2007-04-20 15:13:05
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