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A039595 Fibonacci numbers that are also triangular numbers. 0
1, 3, 21, 55 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 55, p. 20, Ellipses, Paris 2008.

D. Wells, Curious and interesting numbers, Penguin Books, p. 108

CROSSREFS

Cf. A000045, A000217.

Sequence in context: A034186 A027499 A152773 * A033567 A181156 A162394

Adjacent sequences:  A039592 A039593 A039594 * A039596 A039597 A039598

KEYWORD

fini,nonn,full

AUTHOR

Felice Russo (frusso(AT)micron.com)

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Last modified February 14 05:35 EST 2012. Contains 205570 sequences.