General term of a sequence?

Question

These are the first four terms of a sequence:

1, 10, 28, 82

Find a general nth term that fits the sequence.

Answer 1

Favorite Answer

1, 10, 28, 82, ...

an = -2(13n - 11)/(n - 5)

Source(s): http://www.wolframalpha.com/input/?i=1%2C+10%2C+28...

Answer 2

3^n+1 Except the first term which is 1. Others fit.

10 = 3^2 + 1

28 = 3^3 + 1

82 = 3^4 + 1

Answer 3

10=1+1*9

28=10+1*2*9

82=28+1*2*3*9

a(n+1) = a(n)+9n! with a(1)=1.

Answer 4

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Answer 5

9n-7 is the answer popé...