A083202 a(n) = gcd(A000055(n), A000055(n+1)).

1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 1, 3, 15, 15, 1, 2, 1, 1, 10, 10, 92, 1, 1, 2, 1, 1, 1, 1, 6, 6, 2, 2, 57, 1, 1, 15, 3, 2, 2, 2, 5, 3, 6, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 4, 12, 69, 69, 6, 186, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 11, 1, 1, 1

Offset: 0

Author

Jon Perry, Jun 01 2003

Keywords

• nonn

Examples

			A000055(6)=6, A000055(7)=11, so a(6) = gcd(6,11) = 1.
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A000055.

Programs

PARI

{v=[1, 1, 1, 1, 2, 3, 6, 11, 23, 47, 106, 235, 551, 1301, 3159, 7741, 19320, 4 8629, 123867, 317955, 823065, 2144505, 5623756, 14828074, 39299897, 104636890, 2 79793450, 751065460, 2023443032, 5469566585, 14830871802, 40330829030, 109972410]; for (i=1,length(v)-1,print1(gcd(v[i],v[i+1])","))}

Extensions

More terms from Alois P. Heinz, Sep 26 2011