Abstract
We evaluate some types of infinite series with balancing and Lucas-balancing polynomials in closed form. These evaluations will lead to some new curious series for \(\pi \) involving Fibonacci and Lucas numbers. Our findings complement those of Castellanos from 1986 to 1989.
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Acknowledgements
The authors would like to thank the anonymous referees for carefully reading the paper and giving helpful comments and suggestions. The second author would like to thank the University Grant Commission (UGC), India for financial support in the form of a senior research fellowship.
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RF and KP wrote the main manuscript text and both authors contributed equally to this work including calculations, verifications, and table preparation. The first draft of the manuscript was written by RF. All authors have read, reviewed and verified the manuscript.
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Appendix A: Numerical experiments
Appendix A: Numerical experiments
All series that have been derived in this paper have been verified numerically for different values of the parameters m and n using MATLAB. Here, we present some of the numerical results we obtained, i.e., our results concerning the behavior of the partial sums, paying particular attention to Sections 2 and 3. The reference value for \(\pi \) is
3.141592653589793238462643383279502884197169399375105820974944
59230781...
We begin with a comparison of the series (4) and (14), which is summarized in the first table (Table 1).
Series (4) converges much faster to \(\pi \) than (14). For instance, for \(n=25\) the partial sum equals 3.1415926535897931755199500028705 and gives 15 correct decimal places of \(\pi \), whereas series (14) only gives one correct decimal place in this case. Even for the big input \(n=100\) (14) is able to get only 6 correct decimal places for \(\pi \).
The series (21)–(24) and their Fibonacci counterparts from (29)-(31) exhibit much better convergence properties as is seen from the next tables. Finally, we state the numerical results for the series containing squared arguments in the numerator (Tables 2, 3, 4, 5).
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Frontczak, R., Prasad, K. Balancing Polynomials, Fibonacci Numbers and Some New Series for \(\pi \). Mediterr. J. Math. 20, 207 (2023). https://doi.org/10.1007/s00009-023-02413-2
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DOI: https://doi.org/10.1007/s00009-023-02413-2
Keywords
- Balancing polynomial
- Lucas-balancing polynomial
- Fibonacci number
- Lucas number
- infinite series for \(\pi \)