已知数列{an}满足a1=6,an+1-an=2n,记cn=a
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已知数列{an}满足a1=6,an+1-an=2n,记cn=
a
∵an+1-an=2n,
∴an-an-1=2n-2, … a2-a1=2, ∴an-a1=2[(n-1)+(n-2)+…1]=n(n-1) ∴an=n(n-1)+6, ∴cn= an n=n+ 6 n-1≥5-1=4 ∵对一切n∈N*,cn≥M恒成立, ∴M的最大值为4. 故答案为:4.
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