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

Author

Zak Seidov, May 20 2005

Keywords

• nonn

Examples

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

Crossrefs

Cf. A014688.

Programs

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 *)