When prime and set meets

Let P P be the product of all prime numbers less than 90. Find the largest integer N N so that for each n 2 , 3 , 4 , , N n∈{2,3,4,…, N} , the number P + n P+n has a prime factor less than 90.

74 96 86 90 80

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1 solution

The largest N is one less than the prime number just above 90, which is 97

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