A292851 Fibonacci numbers that are also generalized octagonal numbers.

0, 1, 5, 8, 21, 4181

Offset: 0

Author

Tomohiro Yamada, Sep 25 2017

Keywords

• nonn
• easy
• fini
• full

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

• 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).