n1=5, a1=5*5+1=26, n2=2+6=8, a2=8^2+1=65, n3=6+5=11, a3=11^2+1=122, n4=1+2+2=5=n1, 所以 n1,n2,n3,n4,n5,n6,... 就是 5,8,11,5,8,11,5,8,11,5,8,11,... 2010=3*670 所以 n2010=n3=11 a2010=a3=65
a1=26
a2=65
a3=122
a4=26
a5=65
a6=122
....
a2009=a(3*669+2)=a2=65