How many of the first 1992 prime numbers have reciprocals less tahn 0.05?

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17-05-2018
Mathematics

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How many of the first 1992 prime numbers have reciprocals less tahn 0.05?

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icedipping icedipping · Answer 1 · 2018-05-17T07:45:42+02:00

icedipping icedipping

17-05-2018

To have a reciprocal less than 0.05, the prime has to be more than 20. There are 8 primes less than 20, so there are 1992 - 8 = 1984 primes in the first 1992 primes that have reciprocals less than 0.05.

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