If the n-th prime number is 47,then n is( )(英汉词典:the n-th primenumber第n个质数)
A. 12
B. 13
C. 14
D. 15
人气:188 ℃ 时间:2020-04-12 08:13:33
解答
∵47以内的质数是2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,
而第n个质数是47,那么n=15.
故选D.
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