ANSWERS: 7
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Two that I count of: 31 and 37.
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31, 33, 35,37 and 39 so five:)
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I've got 3: 31, 37, and 39. Right?
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hmmmm. 31, 37, 39. three???
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2: 31 and 37. 39=3X13
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The difference between the Euler totient functions of 40 and 30...
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Probably around 40/ln(40) - 30/ln(30), I'd expect.
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