find an expression for the general term of?

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noobzilla
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find an expression for the general term of?

Postby noobzilla » Fri Oct 09, 2009 12:50 am

find an expression for the general term of these sequences?

C) 144, 121, 100, 81, 64, 49…

F) 2, 3, 7, 16, 32, 57…

I've been trying hard, but i can't seem to find a formula which would work for the nth term.

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stapel_eliz
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Postby stapel_eliz » Fri Oct 09, 2009 2:15 pm

noobzilla wrote:C) 144, 121, 100, 81, 64, 49…

What did you find when you considered powers of numbers, such as squares? :wink:

noobzilla wrote:F) 2, 3, 7, 16, 32, 57…

This one is actually fairly complicated. What did you find when you Googled this sequence? :shock:

noobzilla
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Re: find an expression for the general term of?

Postby noobzilla » Sat Oct 10, 2009 11:04 pm

According to yahoo answer, these are possible general terms

ist series numbering from 1^2..is
Tn=T1+(n+1)(n-1)..or Tn=(13-n)^2..goin down the way..
2nd series is
Tn=T1+[(2n-1)(n-1)n]/6..where T1=first term


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