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Volume 53 Number 2 May 2015

CONTENTS

Abdullah Al-Shaghay and Karl Dilcher
Congruences for Partial Sums of Reciprocals
98
     Abstract | Full text

Russell Jay Hendel
Quasi-Periods for the Hofstadter Q Function
112
     Abstract | Full text

Alan Filipin
The Extendibility of D(4)-Pair {F2k,5F2k}
124
     Abstract | Full text

Kimmo Berg, János Flesch, and Frank Thuijsman
Golden and Silver Ratios in Bargaining
130
     Abstract | Full text

Thomas Koshy
Graph-Theoretic Models for the Univariate Fibonacci Family
135
     Abstract | Full text

Martin Griffiths and Alex Bramham
The Jacobsthal Numbers: Two Results and Two Questions
147
     Abstract | Full text

Stéphane Legendre
Labeled Fibonacci Trees
152
     Abstract | Full text

Masayoshi Kaneda
Two Remarks on the Collatz Cycle Conjecture
168
     Abstract | Full text

Peter J. Larcombe and Eric J. Fennessey
A Condition for Anti-Diagonals Product Invariance Across Powers of 2 × 2 Matrix Sets Characterizing a Particular Class of Polynomial Families
175
     Abstract | Full text

Elementary Problems and Solutions
(Edited by Russ Euler and Jawad Sadek)
180
     Full text (Open)

Advanced Problems and Solutions
(Edited by Florian Luca)
186
     Full text (Open)

Neil J. A. Sloane
The John Riordan Prize
192
     Full text (Open)