A107294 GCD of (n + prime(n)) and (n + 1 + prime(n+1)).

1, 1, 1, 1, 1, 1, 3, 1, 1, 3, 7, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 7, 1, 1, 1, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 1, 5, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset

1,7

Links

Table of n, a(n) for n=1..105.

Example

a(139) = 13 because {(139 + prime(139)), (140 + prime(140))} = {936, 949} ={13*72,13*73}.

Mathematica

Table[GCD[n+Prime[n], n+1+Prime[n+1]], {n, 150}]
GCD@@#&/@Partition[Table[n+Prime[n], {n, 150}], 2, 1] (* Harvey P. Dale, Mar 19 2023 *)

Crossrefs

Cf. A014688.

Sequence in context: A246674 A363340 A058735 * A161788 A345468 A351518

Adjacent sequences: A107291 A107292 A107293 * A107295 A107296 A107297

Keyword

nonn

Author

Zak Seidov, May 20 2005

Status

approved