A077053 Greatest common divisor of indecomposable Wallis pairs.

1, 1, 1, 1, 2, 1, 2, 2, 1, 4, 1, 1, 1, 1, 2, 1, 1, 2, 1, 4, 1, 1, 3, 1, 4, 1, 1, 1, 1, 1, 1, 8, 1, 4, 5, 1, 8, 4, 1, 1, 1, 1, 1, 8, 2, 1, 1, 1, 6, 1, 8, 1, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 2, 1, 4, 2, 2, 1, 1, 4, 1, 1, 2, 1, 1, 1, 1, 2, 2, 1, 6, 4

Offset: 1

Author

Klaus Brockhaus, Oct 22 2002

Keywords

• nonn

Comments

Terms > 1 show that (x,y) need not be a Wallis pair if (cx,cy) is a Wallis pair.

Links

• Donovan Johnson, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A072182, A072186, A075768, A075769.

Formula

a(n) = gcd(A075768(n), A075769(n)).

Extensions

Offset corrected by Donovan Johnson, Sep 18 2013