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A082411 Second-order linear recurrence sequence with a(n) = a(n-1) + a(n-2). 4
407389224418, 76343678551, 483732902969, 560076581520, 1043809484489, 1603886066009, 2647695550498, 4251581616507, 6899277167005, 11150858783512, 18050135950517, 29200994734029, 47251130684546, 76452125418575, 123703256103121, 200155381521696, 323858637624817 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(0) = 407389224418, a(1) = 76343678551. This is a second-order linear recurrence sequence with a(0) and a(1) coprime that does not contain any primes. It was found by John Nicol in 1999.

REFERENCES

R. L. Graham, Math. Mag. 37, 1964, pp. 322-324.

D. E. Knuth, Math. Mag. 63, 1990, pp. 21-25.

H. S. Wilf, Letters to the Editor, Math. Mag. 63, 1990.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Tanya Khovanova, Recursive Sequences

J. W. Nicol, A Fibonacci-like sequence of composite numbers

Index to sequences with linear recurrences with constant coefficients, signature (1,1).

FORMULA

G.f.: (407389224418-331045545867*x)/(1-x-x^2). [Colin Barker, Jun 19 2012]

MAPLE

a:= n-> (<<0|1>, <1|1>>^n. <<407389224418, 76343678551>>)[1, 1]:

seq(a(n), n=0..20);  # Alois P. Heinz, Apr 04 2013

CROSSREFS

Cf. A000032 (Lucas numbers), A000045 (Fibonacci numbers), A083103, A083104, A083105, A083216.

Sequence in context: A172714 A080132 A080122 * A113952 A218865 A209833

Adjacent sequences:  A082408 A082409 A082410 * A082412 A082413 A082414

KEYWORD

nonn,easy

AUTHOR

Harry J. Smith, Apr 23 2003

STATUS

approved

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Last modified December 22 07:03 EST 2014. Contains 252328 sequences.