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A292850
Lucas numbers that are also generalized heptagonal numbers.
1
OFFSET
1,2
COMMENTS
Intersection of A000032 and A085787.
Except 4, these are also ordinary heptagonal numbers.
All terms are shown, as confirmed by Srinivasa Rao (2002).
All (generalized) g-gonal numbers in Lucas sequences up to g=20 have been determined, see Tengely (2009).
LINKS
B. Srinivasa Rao, Heptagonal Numbers in the Lucas Sequence and Diophantine Equations x^2(5x-3)^2 = 20y^2+-16, The Fibonacci Quarterly, Vol. 40, No. 4 (2002), 319-322.
Szabolcs Tengely, Finding g-gonal numbers in recurrence sequences, Fibonacci Quarterly, vol.46/47, no.3, pp.235-240, (2009).
CROSSREFS
Cf. A248506 (triangular Lucas Numbers).
Sequence in context: A374563 A057450 A077274 * A080650 A276187 A357041
KEYWORD
nonn,easy,full,fini
AUTHOR
Tomohiro Yamada, Sep 25 2017
STATUS
approved