In Memoriam: Patricia A. Solsaa

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Khristo N. Boyadzhiev Derivative polynomials for tanh, tan, sech and sec in explicit form

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Clark Kimberling The equation m2 - 4k = 5n2 and unique representations of positive integers

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George M. Phillips Index-doubling in sequences by Aitken acceleration

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Florian Luca and Alain Togbé On the Diophantine equation x2 + 72k = yn

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Douglas E. Iannucci and Florian Luca Catalan numbers, factorials, and sums of aliquot parts

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H. W. Gould and Jocelyn Quaintance Products of numbers which obey a Fibonacci-type recurrence

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Spiros D. Dafnis, Frosso S. Makri, and Andreas N. Philippou Restricted occupancy of s kinds of cells and generalized Pascal triangles

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T. Richard Carson Periodic recurrence relations and continued fractions

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Minoru Yabuta The ABC-conjecture and the powerful numbers in Lucas sequences

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George M. Phillips Report on the Twelfth International Conference

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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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Volume Index

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