144 research outputs found

    Evaluation of Tachiya's algebraic infinite products involving Fibonacci and Lucas numbers

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    In 2007, Tachiya gave necessary and sufficient conditions for the transcendence of certain infinite products involving Fibonacci numbers FkF_k and Lucas numbers LkL_k. In the present note, we explicitly evaluate two classes of his algebraic examples. Special cases are∏n=1∞(1+1F2n+1)=3Ο•,∏n=1∞(1+1L2n+1)=3βˆ’Ο•β€‰,\prod_{n=1}^{\infty}(1+\frac{1}{F_{2^n+1}})=\frac{3}{\phi}, \qquad \prod_{n=1}^{\infty}(1+\frac{1}{L_{2^n+1}})=3-\phi\, ,where Ο•=(1+5)/2\phi=(1+\sqrt{5})/2 is the golden ratio.Comment: 4 pages, submitted for publicatio
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