n+1 |
2an |
n+1 |
2an |
n+1 |
4•3n-1 |
2 |
4•30 |
3 |
4•31 |
4 |
4•32 |
n+1 |
4•3n-1 |
1 |
3 |
2 |
4•31 |
3 |
4•32 |
n |
4•3n-1 |
n+1 |
4•3n |
2 |
3 |
2 |
4•30 |
1 |
4•3 |
1 |
4•32 |
1 |
4•3n-1 |
n+1 |
4•3n |
1 |
2 |
1 |
4 |
| ||||
1-
|
n+1 |
4•3n |
5 |
8 |
2n+5 |
8•3n |
bn |
2n |
b1 |
3+1 |
b2 |
3×2+1 |
b3 |
3×3+1 |
bn |
3n+1 |
anbn |
4 |
1 |
n(n+1) |
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