A080051 Common factors of 2^p-1 and the p-th Fibonacci number, p prime.

89, 680081, 260809, 3146161, 1170641, 123209, 423769, 153689, 156329, 179849, 779489, 403889, 208889, 235289, 246809, 279689, 864169, 2376809, 346649, 728369, 1108489, 372809, 380729, 403289, 458009, 1392649, 488009, 503369, 505049

Offset

0,1

Comments

The shown members of the sequence are all prime.

Links

Table of n, a(n) for n=0..28.

Formula

a(n)=gcd(2^A080050(n)-1, fibonacci(A080050(n))).

Example

Example: A080050(1)=11 and 89 divides both 2^11-1=2047 and F(11)=89, so 89 is in the sequence.

Crossrefs

Cf. A074776, A079506, A080050.

Sequence in context: A136031 A145097 A287054 * A243316 A072314 A087538

Adjacent sequences: A080048 A080049 A080050 * A080052 A080053 A080054

Keyword

nonn

Author

Ralf Stephan, Jan 22 2003

Status

approved