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

Author

Hugo Pfoertner, Mar 22 2020

Keywords

• nonn

Links

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

Crossrefs

Cf. A058005, A071416.

Programs

PARI

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

Formula

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