A286540 a(n) = gcd(A259934(n), A259934(n-1)) = A009191(A259934(n)).

2, 2, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 6, 2, 2, 2, 2, 2, 1, 1, 1, 3, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 6, 2, 2, 2, 2, 2, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 6, 2, 2, 6, 2, 2, 6, 2, 2, 2, 2, 2, 2, 2, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 6, 2, 2, 8, 8, 24, 18, 2, 2, 2, 2, 2, 2, 2, 6, 2, 2, 2, 2, 2, 2, 6

Offset: 1

Author

Antti Karttunen, May 21 2017

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..64800 (computed from the b-file of A259934 provided by Robert Israel)

Crossrefs

Cf. A009191, A259934, A259935.

Programs

Scheme

(define (A286540 n) (gcd (A259934 n) (A259934 (- n 1))))
(define (A286540 n) (gcd (A259934 n) (A259935 n)))

Formula

a(n) = gcd(A259934(n), A259934(n-1)) = gcd(A259934(n), A259935(n)).

a(n) = A009191(A259934(n)).