Three Series for the Generalized Golden Mean
Number Theory
2014-01-27 v1 Combinatorics
Abstract
As is well-known, the ratio of adjacent Fibonacci numbers tends to phi = (1 + sqrt(5))/2, and the ratio of adjacent Tribonacci numbers (where each term is the sum of the three preceding numbers) tends to the real root eta of X^3 - X^2 - X - 1 = 0. Letting alpha(n) denote the corresponding ratio for the generalized Fibonacci numbers, where each term is the sum of the n preceding, we obtain rapidly converging series for alpha(n), 1/alpha(n), and 1/(2-alpha(n)).
Cite
@article{arxiv.1401.6200,
title = {Three Series for the Generalized Golden Mean},
author = {Kevin Hare and Helmut Prodinger and Jeffrey Shallit},
journal= {arXiv preprint arXiv:1401.6200},
year = {2014}
}