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A180173 a(n) = gcd(prime(n)-2, n). 1
1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 13, 1, 15, 1, 1, 1, 1, 1, 1, 11, 1, 3, 5, 1, 1, 7, 1, 3, 1, 1, 3, 1, 7, 1, 1, 1, 3, 1, 1, 1, 1, 1, 15, 1, 1, 1, 1, 1, 3, 1, 1, 3, 5, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 69, 1, 1, 3, 73, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..102.

MATHEMATICA

Table[GCD[n, Prime[n]-2], {n, 200}]

CROSSREFS

Cf. A084309, A084310, A180172.

Sequence in context: A014491 A214071 A226915 * A318668 A322361 A219208

Adjacent sequences:  A180170 A180171 A180172 * A180174 A180175 A180176

KEYWORD

nonn

AUTHOR

Zak Seidov, Aug 15 2010

STATUS

approved

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Last modified October 16 16:16 EDT 2019. Contains 328101 sequences. (Running on oeis4.)