[中學] 99省二區1-3
設數列{a(n)}滿足:a(1)=a(2)=1及
a(n+2)={[a(n+1)]^2+a(n+1)+1}/a(n), n=1,2,3,...
試證:數列{a(n)}中任意相鄰兩項都是互質的整數。
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