Contents of Volume13,

**Journal of Recreational Mathematics,**1980-81# Number 1

Editor’s Page, by Harry L. Nelson

“On Kaprekar’s Harshad Numbers,” by D. R. Kaprekar

“Minimal Fault-Free Rectangles Packed With I

_{n}Polyominoes,” by Karl Scherer
“Unlikely Pairs,” by Dan Shine

“Wallpaper Rings,” by Doug Engel

“Lowest Order Squared Rectangles and Squares with a Cross,”
by A. J. W. Duijvestijin and P. Leeuw

“Some Math Magic,” by Lee Markowitz

“Isoperimetrical Polyominoes,” by Andrew L. Clarke

“Years Expressed as Distinct-Digit Fractions,” by Stewart
Metchette

“Triples,” by Rhombus

“Nearly-Doubled Primes,” by Jean Meeus and Claude Lalout

“Integers with Consecutive Digits,” by Charles W. Trigg

The 27

^{th}Mersenne Prime
“How to Find the Day of Week of Any Date in the 20

^{th}Century,” by Key Chang and Feng Chang
“Ideally Symmetric Alphametics,” by Steven Kahan

“Around the World in Four Dimensions,” by Makoto Arisawa

“A Matter of Morphic Nomenclature,” by Charles W. Trigg

Alphametics and Solutions to 12(1) Alphametics, edited by Steven
Kahan

Problems and Conjectures, edited by Friend H. Kierstead, Jr.

Solutions to Problems and Conjectures, edited by John Brinn
and Romae Cormier

Solvers List

Filler Fun on Pages 3, 17, 28, 35, 38, 41, 47, 49, 55, 78

# Number 2

“On Kaprekar Numbers,” by D. R. Kaprekar

“Treating 1979/1980 in an Orderly Manner,” edited by C. S.
Metchette

“The Four-Numbers Game,” by Michel Dumont and Jean Meeus

“The Gypsy Method of Superfigure Construction,” by Jack
Gilles, Jr.

“Squaragons,” by C. S. Elliot

“On the ‘Rule of 72’,” by Matthew J. Liberatore

“A New Way to Play Ramsey Games,” by Geoffrey Exoo

“Overhanging ‘LEGO’ Towers,” by Edgar Heilbronner

“The Near-Sighted Hunter,” by Robert I. Reynolds

Letters to the Editor, edited by Harry L. Nelson

Book Reviews, edited by Charles W. Trigg

Alphametics and Solutions to 12(2) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Friend H Kierstead, Jr.

Solutions to Problems and Conjectures, edited by John Brinn
and Romae Cormier

Solvers List

Plus: Filler Fun on pages: 82, 96, 110, 113, 117, 120, 130,
136, 140, 158

# Number 3

Editor’s Page, by Joseph S. Madachy

“A Solution to Archimedes’ Cattle Problem,” by Harry L.
Nelson

“Dots Avoidance,” by Frank Harary and Michael S. Weisbach

“Square Repdigits,” by Charles W. Trigg

“Rectangles from Mixed Polyomino Sets,” by Richard G.
Laatsch

“Double and Triple Shift Permutations on Integers,” by
Mannis Charosh

“An Evening With Pi,” by James Davis

Letter to the Editor, by Jean Meeus

“The Perfect Magic Cube of Order 4,” by John R. Hendricks

Book Reviews, edited by Charles W. Trigg, Kenneth M. Wilke,
Joseph E. Lemire and Harry L. Nelson

Alphametics and Solutions to 12(3) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Friend H. Kierstead, Jr.

Solutions to 12(3) Problems and Conjectures, edited by John
H. Brinn and Romae Cormier

Solvers’ List

# Number 4

“Birds on a Wire, Cows in the Field, and Stars in the
Heavens,” by Charles Kluepfel

“Notices,” by David E. Kullman

“The Rainbow Highways of Oz,” by Charles J. Colbourn and
Eric Mendelsohn

“Introduction to the Eisenberg Box,” Craig H. Collins

“A Square Acutely Triangulated,” by Charles Cassidy and
Graham Lord

“A Family of Sixteenth Order Magic Squares,” by Charles W.
Trigg

“The Pan-3-Agonal Magic Cube of Order 4,” by John R.
Hendricks

“Recursively Prime Sequences,” by John Michael Schram

Book Reviews, edited by Charles W. Trigg

Alphametics and Solutions to 12(4) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Friend H. Kierstead, Jr.

Solutions to Problems and Conjectures, edited by John Brinn
and Romae Cormier

Solvers’ List

Filler Fun on pages 249, 262, 273, 281, 284, 289, 299, 317

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