3 |
2 |
1 |
a1 |
1 |
a2 |
1 |
a3 |
1 |
a2009 |
A.3 | B.2 | C.1 | D.0 |
1 |
an+1-1 |
1 |
an(an-1) |
1 |
an-1 |
1 |
an |
1 |
an-1 |
1 |
an+1-1 |
1 |
an |
1 |
a1 |
1 |
a2 |
1 |
a3 |
1 |
a2009 |
1 |
a1-1 |
1 |
a2010-1 |
1 |
a2010-1 |
3 |
2 |
7 |
4 |
37 |
16 |
1 |
a2010-1 |
1 |
2 |
1 |
2 |
an-an2 |
A.1506 | B.3012 | C.1004 | D.2008 |
1 |
anan+1 |
n |
an |
Sn |
n |
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