已知数列{an}满足an+1+an=4n-3(n∈N*),若对任意n∈N*,都有an^2+an+1^2>=20n-15成立,则a1的取值范围是

已知数列{an}满足an+1+an=4n-3(n∈N*),若对任意n∈N*,都有an^2+an+1^2>=20n-15成立,则a1的取值范围是
已知数列{an}满足an+1+an=4n-3(n∈N*),若对任意n∈N*,都有an^2+an+1^2>=20n-15成立,则a1的取值范围是

已知数列{an}满足an+1+an=4n-3(n∈N*),若对任意n∈N*,都有an^2+an+1^2>=20n-15成立,则a1的取值范围是