【摘要】 设{an}n∞=1是满足递推关系a1=1,an+1=a2n+4an+2(n≥1)的数列.本文证明了:当n是偶数时,an仅当n=2时是素数.更多还原

【Abstract】 Let {a_n}^∞_n=1 be a sequence which satisfy a₁=1,a_n+1=a²_n+4a_n+2（n≥1）.In this paper we prove that a₂=7 is a unique prime in {a_n}^∞_n=1 with n is even.更多还原