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27-11-2018
Mathematics

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What is the greatest prime you must consider to test whether 575 is prime

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MrBillDoesMath MrBillDoesMath

30-11-2018

Hello from MrBillDoesMath!

Answer: 23

Discussion:

We only need to check primes less that the square root of 576, which is about 23.98. As 23 is a prime number, it is the answer to the question.

Another way of looking at this: the primes less than or equal to 23

(23*23 = 529)

2, 3, 5,7,11,13,17,19,23

The greatest prime in the list is 23

Thank you,

MrB

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