Write down the tight answer :（1）2,9,28,65,（ ）
问题描述：
Write down the tight answer :（1）2,9,28,65,（ ）
答
a1=1^3+1
a2=2^3+1
a3=3^3+1
a4=4^3+1
...
an=n^3+1
5^3+1=126
希望能帮到您!
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