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How many of the first 2019 positive integers have no odd single-digit prime factors?

 May 13, 2020
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Don't really understand your question, but ALL powers of 2 up to 2019 have only even prime factors:

 

2, 4, 8, 16, 32, 64, 128, 256, 512 and 1024 = 10 such numbers - if that is what you meant!

 May 13, 2020

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