OFFSET
0,1
COMMENTS
a(0) = 1786772701928802632268715130455793, a(1) = 1059683225053915111058165141686995. This is the second-order linear recurrence sequence with a(0) and a(1) coprime that R. L. Graham in 1964 stated did not contain any primes. It has not been verified. Graham made a mistake in the calculation that was corrected by D. E. Knuth in 1990.
REFERENCES
P. Ribenboim, The Little Book of Big Primes. Springer-Verlag, 1991, p. 178.
LINKS
Indranil Ghosh, Table of n, a(n) for n = 0..4617
R. L. Graham, A Fibonacci-Like sequence of composite numbers, Math. Mag. 37 (1964) 322-324
D. Ismailescu, J. Son, A New Kind of Fibonacci-Like Sequence of Composite Numbers, J. Int. Seq. 17 (2014) # 14.8.2.
Tanya Khovanova, Recursive Sequences
D. E. Knuth, A Fibonacci-Like sequence of composite numbers, Math. Mag. 63 (1) (1990) 21-25
Carlos Rivera, Problem 31. Fibonacci- all composites sequence, The Prime Puzzles and Problems Connection.
Index entries for linear recurrences with constant coefficients, signature (1,1).
FORMULA
G.f.: (1786772701928802632268715130455793-727089476874887521210549988768798*x)/(1-x-x^2). [Colin Barker, Jun 19 2012]
MATHEMATICA
LinearRecurrence[{1, 1}, {1786772701928802632268715130455793, 1059683225053915111058165141686995}, 70] (* Harvey P. Dale, Oct 17 2011 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Harry J. Smith, Apr 22 2003
STATUS
approved