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Volume 45 Number 4 November 2007

CONTENTS

In Memoriam: Patricia A. Solsaa 290
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Khristo N. Boyadzhiev
Derivative polynomials for tanh, tan, sech and sec in explicit form
291
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Clark Kimberling
The equation m2 - 4k = 5n2 and unique representations of positive integers
304
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George M. Phillips
Index-doubling in sequences by Aitken acceleration
313
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Florian Luca and Alain Togbé
On the Diophantine equation x2 + 72k = yn
322
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Douglas E. Iannucci and Florian Luca
Catalan numbers, factorials, and sums of aliquot parts
327
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H. W. Gould and Jocelyn Quaintance
Products of numbers which obey a Fibonacci-type recurrence
337
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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
347
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T. Richard Carson
Periodic recurrence relations and continued fractions
357
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Minoru Yabuta
The ABC-conjecture and the powerful numbers in Lucas sequences
362
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George M. Phillips
Report on the Twelfth International Conference
366
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Elementary Problems and Solutions
(Edited by Russ Euler and Jawad Sadek)
368
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Advanced Problems and Solutions
(Edited by Florian Luca)
376
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Volume Index
383
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