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A013586
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Smallest prime p such that n divides one of f(p)-1, f(p) or f(p)+1, where f(p) is product of primes <= p, or 0 if no such p exists.
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0
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2, 2, 2, 0, 3, 3, 3, 0, 0, 5, 7, 0, 13, 7, 5, 0, 17, 0, 7, 0, 7, 11, 23, 0, 0, 13, 0, 0, 5, 5, 5, 0, 11, 17, 7, 0, 23, 19, 13, 0, 41, 7, 43, 0, 0, 23, 47, 0, 0, 0, 17, 0, 19, 0, 11, 0, 19, 29, 13, 0, 17, 31, 0, 0, 13, 11, 67, 0, 23, 7, 71, 0, 53, 37, 0, 0, 11, 13, 29, 0, 0, 41, 83, 0, 17, 43, 29, 0
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