Abdullah Al-Shaghay and Karl Dilcher Congruences for Partial Sums of Reciprocals

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Russell Jay Hendel Quasi-Periods for the Hofstadter Q Function

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Alan Filipin The Extendibility of D(4)-Pair {F2k,5F2k}

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Kimmo Berg, János Flesch, and Frank Thuijsman Golden and Silver Ratios in Bargaining

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Thomas Koshy Graph-Theoretic Models for the Univariate Fibonacci Family

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Martin Griffiths and Alex Bramham The Jacobsthal Numbers: Two Results and Two Questions

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Stéphane Legendre Labeled Fibonacci Trees

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Masayoshi Kaneda Two Remarks on the Collatz Cycle Conjecture

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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

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Elementary Problems and Solutions (Edited by Russ Euler and Jawad Sadek)

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Advanced Problems and Solutions (Edited by Florian Luca)

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Neil J. A. Sloane The John Riordan Prize

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