Composite to Prime Ratios

There
are more composite numbers (non-prime) than prime numbers. By the time
you've counted to 28 there are more than twice as many composites as
primes. How many numbers must be counted before the ratio is equal to or greater than 3? Than 4, 5, 6, 7, 8, 9, 10? |

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Last Updated: July 11th, 2010.