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据报道目前用超级计算机找到的最大质数是2859433-1,这个质数的末尾数字是A.1B.3C.7D.9
据报道目前用超级计算机找到的最大质数是2859433-1,这个质数的末尾数字是A.1B.3C.7D.9
发布时间:2020-08-07 03:31:39
据报道目前用超级计算机找到的最大质数是2859433-1,这个质数的末尾数字是A.1B.3C.7D.9
网友回答
A解析根据以2为底数的幂,其末尾数的变化规律是2,4,8,6,依次循环,859433=214858×4+1,2859433-1的末尾数是2.
解答:
解:∵859433=214858×4+1,
∴2859433的末尾数与21的末尾数相同,都为2,
∴2859433-1的末尾数是1.
故选A.
点评:
本题考查的是质数与合数,解答此题的关键是找出以2为底数的幂末尾数的变化规律.
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