lupire
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191, 193, 197, 199 are also twin twin prime pairs These primes have to be 11,13,17,19 + 30k, due to division by 3. 5 is half of 10, so we easily rule out exactly the number 10x+5. 49 = 7², 77 is a multiple of 7, of course. 98 = 2 • 7² In or - 800.▲
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