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Participate: 
5516281 is the smallest prime p such that p+1 = 2 times a
prime, p+2 = 3 times a prime, p+3 = 4 times a prime, p+4 =
5 times a prime, p+5 = 6 times a prime and p+6 = 7 times a
prime. [Firoozbakht]
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