Fibonacci s-Cullen and s-Woodall Numbers
Diego Marques
Departamento de Matemática
Universidade de Brasília
Brasília, Brazil
Ana Paula Chaves
Instituto de Matemática e Estatística
Universidade Federal de Goiás
Goiás, Brazil
Abstract:
The m-th Cullen number Cm is a number of the form
m2m + 1
and the m-th
Woodall number Wm has the form
m2m - 1
In 2003, Luca and Stănică
proved that the largest Fibonacci number in the Cullen sequence is
F4 = 3
and that F1 = F2 = 1 are the largest
Fibonacci numbers in the Woodall sequence. Very recently, the second
author proved that, for any given s > 1, the equation
Fn = msm ±
1 has only finitely many solutions, and they are effectively
computable. In this note, we shall
provide the explicit form of the possible solutions.
Full version: pdf,
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(Concerned with sequences
A000045
A002064.)
Received
October 11 2014;
revised versions received December 24 2014.
Published in Journal of Integer Sequences, January 6 2015.
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