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HMMT 十一月 2014 · 冲刺赛 · 第 4 题

HMMT November 2014 — Guts Round — Problem 4

专题
Contest Math / 竞赛数学
难度
L3
来源
HMMT

题目详情

英文原题

  1. [ 6 ] How many two-digit prime numbers have the property that both digits are also primes?
解析

英文解析

  1. [ 6 ] How many two-digit prime numbers have the property that both digits are also primes?
    Answer: 4 When considering the 16 two-digit numbers with 2, 3, 5, and 7 as digits, we find thatonly 23, 37, 53, and 73 have this property.