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

1,5

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

Formula

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

Crossrefs

Cf. A072182, A072186, A075768, A075769.

Sequence in context: A351289 A177954 A337312 * A373127 A363345 A344651

Adjacent sequences: A077050 A077051 A077052 * A077054 A077055 A077056

Keyword

nonn

Author

Klaus Brockhaus, Oct 22 2002

Extensions

Offset corrected by Donovan Johnson, Sep 18 2013

Status

approved