Observation:-2004,20052,-20063,20074... then number n is ______.

∵-2004=(-1)1(1+2003)1,20052=(-1)2(2+2003)2,
-20063=(-1)3(3+2003)3,20074=(-1)4(4+2003)4…
The number n of is:(-1) n (n+2003) n,
Therefore, the answer is:(-1) n (n+2003) n.

Observation:-2004,20052,-20063,20074... then number n is ______.

∵-2004=(-1)1(1+2003)1,20052=(-1)2(2+2003)2,
-20063=(-1)3(3+2003)3,20074=(-1)4(4+2003)4…
The number n of is:(-1) n (n+2003) n,
Therefore, the answer is:(-1) n (n+2003) n.

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