The night manager then takes the people on the first of the infinite buses and assigns them to the room number of the next prime, 3, raised to the power of their seat number on the bus.
Twin primes are prime numbers that are separated by just one number, like 11 and 13, or 17 and 19. And as you go up the number line, primes occur less frequently, and twin primes are rarer still.
These included 10 problems from an American maths competition, find the number of ordered pairs of prime numbers that sum to 60, and 10 reading questions from America's SAT school leavers exam.
其中包括自美国学竞赛 10 道问题,找出总和为 60 有序对量, 以及自美国 SAT 学校毕业生考试 10 道阅读题。
Some were elegant, prime number solutions and prototype responses, genetic algorithms crafted to figure out what the other person was doing and suss them out.