Contents of Volume 21,

**Journal of Recreational Mathematics**# Number 1

“Goldbach’s Comet: The Numbers Related to Goldbach’s
Conjecture,” by Henry F. Fliegel and Douglas S. Robertson

“Skewered Plane Geometry,” by Charles W. Trigg

“Pythagorean Quadrilaterals,” by Andy Pepperdine

“Groups of Magic Tessaracts,” by John Robert Hendriccks

“Searching for Wilson Primes,” Harvey Dubner

“On Tetradic or 4-Way Primes,” by Rudolf Ondrejka

“More and More Magic Tessaracts,” by John Robert Hendricks

“Fujita Configurations,” by Hiroshi Okumura

“Pentagonal Numbers Concatenated to Form Pentagonal
Numbers,” by Charles W. Trigg

“Does the American Presidency Shorten Life?” by Paul M.
Sommers

“Sum of the Stepping Powers of the Digits of Integers,” by
Alex Zimmermann

“Polygonal Repdigits,” by Charles W. Trigg

“Powers With Distinct Digits in Base Seven,” by Charles W.
Trigg

“The Pan-4-Agonal Magic Tessaract of Order 4,” by John
Robert Hendricks

Alphametics and Solutions to 20(1) Alphametics, edited by
Steven Kahan

“Digits Imbedded in Adages – II,” by Charles W. Trigg

Problems and Conjectures, edited by Joseph S. Madachy

Solutions to Problems and Conjectures, edited by Joseph S.
Madachy

Errata

Solvers’ List

# Number 2

“A Perfect 4-Dimensional Hypercube of Order 7 – ‘The Cameron
Cube’,” by Joseph Arkin, David C. Arney and Bruce J. Porter

“Large Factorial,” by John R. Hendricks

“Digit Equations,” by Charles W. Trigg

“Some Remarks Concerning the Gregorian Calendar,” by R. M.
Sternheimer

“Palindromes and Magic Squares,” by Allan William Johnson,
Jr.

Letter to the Editor, by Allan William Johnson, Jr.

“Nests of Primes,” by Harry L. Nelson

“Supermagic and Antimagic Graphs,” by Nora Hartsfield and
Gerhard Ringel

“On Pedestrians, City Blocks and Traffic Lights,” by Hans
Sagan

“Hailstone (3n + 1) Number Graphs,” by Clifford A. Pickover

Answers to Digit Equations

“Concatenated Repdigit Dyad Squares,” by Charles W. Trigg

“A Postmortem on the Death-Dip Hypothesis,” by Paul M.
Sommers

“Octagonal Permutations of Consecutive Digits,” by Charles
W. Trigg

“Are There Irrational Square Roots Which Are Infinite
Reversals of Each Other?” by John DiPrete

“More on 1729,” by Chanchal Singh

Alphametics and Solutions to 20(2) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Joseph S. Madachy

Solutions to Problems and Conjectures, edited by Joseph S.
Madachy

“1989 – A Prime Palindromic (!) Year,” by Harvey Dubner

Solvers’ List

# Number 3

“The Golden Boys of Summer, 1987,” by Paul M. Sommers

Sixteenth Annual Student Conference

“Diophantine Equation Graphs for x^2 * y = c,” by Clifford
A. Pickover and Akhlesh Lakhtakia

“Permutation-Twin Square Integers,” by Charles W. Trigg

“Digits Imbedded in Adages – III,” by Charles W. Trigg

“Divisibility Tests in Base-10^r and a Well-Known Party
Trick,” by Oliver D. Anderson

“The Determinant of a Pandiagonal Magic Square of Order 4 Is
Zero,” by John R. Hendricks

“Pictures of Fourier Synthesis,” by Stuart Anstis

Seventeenth Annual Mathematics and Statistics Conference:
Issues in the Teaching of Calculus

“Generalized Cullen Numbers,” by Harvey Dubner

“Scouts in Space,” Sherri Shepard and Andrew Simoson

“Some New Dissections,” by Alfred Varsady

“A Digital Bracelet for 1989,” by Charles W. Trigg

Alphametics and Solutions to 20(3) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Joseph S. Madachy

Solutions to Problems and Conjectures, edited by Joseph S.
Madachy

Solvers’ List

Errata

# Number 4

Charles W. Trigg – In Memorium

“The Beast 666,” by Chanchal Singh

“A 5-Dimensional Magic Hypercube of Order 3,” by John Robert
Hendricks

“Prime Permutations of Distinct Digit Sets,” by Charles W.
Trigg

“Nonagonal Permutations of Consecutive Digits,” by Charles
W. Trigg

“The Amazing 1989,” by Chanchal Singh

“Picturing Randomness with Truchet Tiles,” by Clifford A.
Pickover

“Digits Imbedded in Adages, IV,” by Charles W. Trigg

“Joint Distributions,” by Karen J. Devine, Viraj M. Mirani
and Paul M. Sommers

“Some Results Concerning Pythagorean Triplets,” by R. M.
Sternheimer

“A New Primorial Prime,” by Harvey Dubner

“More 1989 ‘Prime’ Facie,” by Harvey Dubner

“T-Dissections of Hexagons and Triangles,” by David A.
Paterson

“The Nature of Repeating Decimals,” by Oliver D. Anderson

“Mixing Numeration Systems,” by Samuel Yates

“The Near Repdigit Primes 333 . . . 331,” by Chris K.
Caldwell

Book Reviews, edited by Charles W. Trigg

Letters to the Editor

Alphametics and Solutions to 20(4) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Joseph S. Madachy

Solvers’ List

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