A333461 a(n) = gcd(2*n, binomial(2*n,n))/2.

1, 1, 1, 1, 1, 6, 1, 1, 1, 2, 1, 2, 1, 2, 15, 1, 1, 6, 1, 10, 3, 2, 1, 6, 1, 2, 1, 28, 1, 2, 1, 1, 3, 2, 7, 2, 1, 2, 1, 10, 1, 42, 1, 4, 45, 2, 1, 6, 1, 2, 3, 4, 1, 6, 1, 4, 3, 2, 1, 12, 1, 2, 3, 1, 5, 66, 1, 2, 3, 10, 1, 18, 1, 2, 15, 4, 77, 6, 1, 10, 1, 2

Offset

1,6

Links

Hugo Pfoertner, Table of n, a(n) for n = 1..10000

Formula

a(n) = A058005(n)/2.

Prog

(PARI) for(n=1, 82, print1(gcd(2*n, binomial(2*n, n))/2, ", "))

Crossrefs

Cf. A058005, A071416.

Sequence in context: A344877 A356156 A356157 * A325975 A325813 A344704

Adjacent sequences: A333458 A333459 A333460 * A333462 A333463 A333464

Keyword

nonn

Author

Hugo Pfoertner, Mar 22 2020

Status

approved