A292851 Fibonacci numbers that are also generalized octagonal numbers.

0, 1, 5, 8, 21, 4181

Offset

0,3

Comments

Intersection of A000045 and A001082.

These are all the terms, as confirmed by Tengely (2009).

All (generalized) g-gonal numbers in Lucas sequences up to g=20 have been determined, see Tengely (2009).

Links

Table of n, a(n) for n=0..5.

Szabolcs Tengely, Finding g-gonal numbers in recurrence sequences, Fibonacci Quarterly, vol.46/47, no.3, pp.235-240, (2009).

Crossrefs

Cf. A000045, A001082.

Cf. A039595 (triangular Fibonacci numbers).

Sequence in context: A363224 A277369 A140419 * A138023 A120037 A120038

Adjacent sequences: A292848 A292849 A292850 * A292852 A292853 A292854

Keyword

nonn,easy,fini,full

Author

Tomohiro Yamada, Sep 25 2017

Status

approved