Today is “twin day” at ACS. Pairs of students are supposed to dress alike. So, to follow the theme…

Twin primes are prime numbers that differ by two. Examples are 3 and 5, 41 and 43, and 101 and 103. In 300 B.C., Euclid proposed that there are an infinite number of twin primes. Some 2300 years later, no proof of this conjecture exists, though mathematicians have found twin primes that are over 100,000 digits long.

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