问题 填空题

已知数列{an}满足a1=1,an+1=an+2n,则a10=______.

答案

∵数列{an}满足a1=1,an+1=an+2n
∴an=a1+(a2-a1)+…+(an-an-1)=1+21+22+…+2n-1=

2n-1
2-1
=2n-1.(n∈N*).
∴a10=210-1=1023.
故答案为:1023.

单项选择题
单项选择题