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1-13: Out. Only two multiple of 6
6-18: 3 multiples of 6, two multiples of 5 are also multiples of 2 or 3. --> 4 primes
12-24: 3 multiples of 6, 2 multiples of 5 are also multiples of 2 or 3 --> 4 primes
Should always end up with 4 primes. Sufficient.
6-18: 3 multiples of 6, two muliples of 7, and one is not a multiple of 2/3 --> 4 primes
Can't think of any other series that satisfies the criteria set in st2. Should be be just 6-18. In any case, the number of primes integers in this set = 4. Sufficient.
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