n |
n+1 |
6n |
(n+1)(2n+1) |
5 |
3 |
an |
anan-1 |
(1-2n)anan-1 |
anan-1 |
an-1 |
anan-1 |
1 |
an-1 |
1 |
an |
1 |
an |
1 |
an-1 |
1 |
an |
1 |
a1 |
1 |
a2 |
1 |
a1 |
1 |
a3 |
1 |
a2 |
1 |
an |
1 |
an-1 |
n(1+2n-1) |
2 |
1 |
a1 |
1 |
n2 |
1 |
n2 |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
n2 |
1 |
(n-1)n |
1 |
n-1 |
1 |
n |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n-1 |
1 |
n+1 |
1 |
n+1 |
1 |
n2 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
n |
n+1 |
n |
n+1 |
1 |
n2 |
4 |
4n2 |
4 |
(2n-1)(2n+1) |
1 |
2n-1 |
1 |
2n+1 |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
7 |
1 |
2n-1 |
1 |
2n+1 |
5 |
3 |
2 |
2n+1 |
5 |
3 |
6n |
(n+1)(2n+1) |
n |
n+1 |
6n |
(n+1)(2n+1) |
1 |
4 |
5 |
4 |
6n |
(n+1)(2n+1) |
6×2 |
(2+1)(4+1) |
4 |
5 |
5 |
4 |
4 |
5 |
6n |
(n+1)(2n+1) |
6n |
(n+1)(2n+1) |
5 |
3 |
an•bn |
n |
1 |
an+1 |
1 |
an |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
n×(n+1) |
2008 |
2009 |
1 |
a1 |
1 |
a2 |
1 |
a3 |
1 |
a2011 |
A.
| B.
| C.
| D.
|
an+1 |
2 |
1 |
anan+1 |
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