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Mathematics 26 Online
OpenStudy (anonymous):

How do you write a description of the set: {1,2,3,5,7,11,13,17,19}?

OpenStudy (anonymous):

Prime numbers, and the number 1.

OpenStudy (anonymous):

Prime numbers at the beginning of the 20th century (today 1 is no longer regarded as a prime). http://oeis.org/A008578

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