OFFSET
1,2
COMMENTS
a(n) = n for n in A014847. - Reinhard Zumkeller
a(n) = gcd(n, C(n)), C(n) the Catalan numbers. - Peter Luschny Oct 06 2011
LINKS
T. D. Noe, Table of n, a(n) for n = 1..1000
Eric Weisstein's World of Mathematics, Central Binomial Coefficient
EXAMPLE
a(10) = gcd(10, binomial(20, 10)) = gcd(10, 184756) = 2.
MATHEMATICA
Table[GCD[n, Binomial[2n, n]], {n, 100}] (* Harvey P. Dale, Nov 10 2011 *)
CROSSREFS
KEYWORD
nonn,nice
AUTHOR
Reinhard Zumkeller, May 29 2002
STATUS
approved