|
%I #15 Mar 22 2020 09:58:45
%S 2,2,2,2,2,12,2,2,2,4,2,4,2,4,30,2,2,12,2,20,6,4,2,12,2,4,2,56,2,4,2,
%T 2,6,4,14,4,2,4,2,20,2,84,2,8,90,4,2,12,2,4,6,8,2,12,2,8,6,4,2,24,2,4,
%U 6,2,10,132,2,4,6,20,2,36,2,4,30,8,154,12,2,20,2,4,2,56,10,4,6,88,2,20
%N a(n) = gcd(2*n, binomial(2*n, n)).
%C a(n)=2 for values like 1,2,3,4,5,7,...; a(n)=2n for values like 6,15,...,190.
%Y Cf. A001405, A071416.
%K nonn
%O 1,1
%A _Labos Elemer_, Nov 13 2000
%E Name corrected by _Hugo Pfoertner_, Mar 22 2020
|
