<h5>For how many integers, a, between 30 and 40 is it true that 5/a, 8/a and 13/a are all in lowest terms?</h5>

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For how many integers, a, between 30 and 40 is it true that 5/a, 8/a and 13/a are all in lowest terms?

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For how many integers, a, between 30 and 40 is it true that 5/a, 8/a and 13/a are all in lowest terms?