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 A180172 a(n) = gcd(prime(n)+2, n). 1
 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 11, 3, 1, 1, 1, 1, 1, 9, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 5, 1, 1, 1, 1, 1, 9, 1, 1, 13, 5, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 11, 1, 1, 1, 1, 71, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 15, 7, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS MATHEMATICA Table[GCD[n, Prime[n]+2], {n, 200}] CROSSREFS Cf. A084309, A084310, A180173. Sequence in context: A061494 A141901 A200473 * A327372 A090751 A322127 Adjacent sequences:  A180169 A180170 A180171 * A180173 A180174 A180175 KEYWORD nonn AUTHOR Zak Seidov, Aug 15 2010 STATUS approved

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)