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A192222 Fibonacci(2^n + 1). 4
1, 2, 5, 34, 1597, 3524578, 17167680177565, 407305795904080553832073954, 229265413057075367692743352179590077832064383222590237 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

product(n>0, (1 + 1/a(n))) = 3/phi = A134973, where phi = (1+sqrt(5))/2 is the golden mean.

REFERENCES

Y. Tachiya, Transcendence of certain infinite products, J. Number Theory 125 (2007), 182-200.

LINKS

Table of n, a(n) for n=0..8.

J. Sondow, Evaluation of Tachiya's algebraic infinite products involving Fibonacci and Lucas numbers, Diophantine Analysis and Related Fields 2011 - AIP Conference Proceedings, vol. 1385, pp. 97-100.

FORMULA

a(n) = A000045(2^n + 1)

MATHEMATICA

Table[Fibonacci[2^n + 1], {n, 0, 10}] (* T. D. Noe, Jan 11 2012 *)

CROSSREFS

Cf. A000045 (Fibonacci numbers F(n)), A134973 (decimal expansion of 3/phi), A192223 (Lucas(2^n + 1)).

Sequence in context: A206830 A277436 A002665 * A241586 A000665 A058882

Adjacent sequences:  A192219 A192220 A192221 * A192223 A192224 A192225

KEYWORD

nonn,easy

AUTHOR

Jonathan Sondow, Jun 26 2011

STATUS

approved

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Last modified December 12 16:18 EST 2017. Contains 295939 sequences.