已知数列{an}满足an•an-2=an-1(n>2,n∈N),且a1=2,a2=3,则a2013=_.
问题描述:
已知数列{an}满足an•an-2=an-1(n>2,n∈N),且a1=2,a2=3,则a2013=______.
答
∵数列{an}满足an•an-2=an-1(n>2,n∈N),且a1=2,a2=3,∴a3•a1=a2,解得a3=
,3 2
a4•a2=a3,解得a4=
,1 2
a5•a3=a4,解得a5=
.1 3
a6•a4=a5,解得a6=
.2 3
a7•a5=a6,解得a7=2.
….
∴an+6=a1.
∴a2013=a335×6+3=a3=
.3 2
故答案为
.3 2