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

1,1

Links

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

Formula

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

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

Prog

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

Crossrefs

Cf. A009191, A259934, A259935.

Sequence in context: A174399 A056881 A260322 * A229980 A184158 A060779

Adjacent sequences: A286537 A286538 A286539 * A286541 A286542 A286543

Keyword

nonn

Author

Antti Karttunen, May 21 2017

Status

approved