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A275275
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n! - p, where p is the second greatest prime < n!.
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1
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4, 5, 3, 5, 11, 11, 17, 37, 17, 17, 17, 13, 61, 17, 59, 71, 61, 43, 113, 71, 41, 101, 191, 103, 191, 179, 71, 127, 37, 79, 113, 163, 47, 373, 293, 157, 149, 79, 167, 211, 151, 89, 131, 113, 73, 107, 179, 227, 173, 113, 257, 239, 151, 227, 163, 509, 293, 347
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OFFSET
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1,1
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COMMENTS
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Is every term except 4 a prime?
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LINKS
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EXAMPLE
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For n = 4, we have n! = 24, so that p = 19, and a(4) = 5.
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MATHEMATICA
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Table[n! - NextPrime[n!, -2], {n, 1, 150}]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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