A089086 Greatest common divisor of n^2-5 and n^2+5.

5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 2, 1, 2, 5

Offset: 0

Author

Cino Hilliard, Dec 05 2003

Keywords

• easy
• nonn

Links

• Harvey P. Dale, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A109013.

Programs

Mathematica

GCD@@#&/@Table[n^2+{5,-5},{n,0,110}] (* Harvey P. Dale, Jul 17 2016 *)

PARI

g(n) = for(x=0,n,print1(gcd(x^2-5,x^2+5)","))