# [SOLVED] sequencing

• April 12th 2010, 02:08 AM
Amberosia32
[SOLVED] sequencing
I am trying to find the patterns but I don't see any.

8, 40/3, 152/9, 520/27, 1688/81 I know the denominator is 3^(n-1) *where n starts at 3
• April 12th 2010, 03:34 AM
mr fantastic
Quote:

Originally Posted by Amberosia32
I am trying to find the patterns but I don't see any.

8, 40/3, 152/9, 520/27, 1688/81 I know the denominator is 3^(n-1) *where n starts at 3

$a_n = 8 \times 3^{1-n}(3^n - 2^n)$.
• April 12th 2010, 05:23 AM
Failure
Quote:

Originally Posted by Amberosia32
I am trying to find the patterns but I don't see any.

8, 40/3, 152/9, 520/27, 1688/81 I know the denominator is 3^(n-1) *where n starts at 3

If you are really, really desperate you can always go to www.wolframalpha.com and just enter your list of numbers. This is what I got:
8, 40&#x2f;3, 152&#x2f;9,520&#x2f;27,1688&#x2f;81 - Wolfram|Alpha
• April 12th 2010, 10:37 AM
Amberosia32
Quote:

Originally Posted by Failure
If you are really, really desperate you can always go to www.wolframalpha.com and just enter your list of numbers. This is what I got:
8, 40&#x2f;3, 152&#x2f;9,520&#x2f;27,1688&#x2f;81 - Wolfram|Alpha

That's a very useful tool thank you.