Contents of Volume 3,

**Journal of Recreational Mathematics**, 1970# Number 1

“Knight’s Tours Into Non-Magic Squares,” by Charles W. Trigg

“’An Unusual Integer’ – A Comment,” by V. G. Hobbes

“Packing a Box with Y-Pentacubes,” by C. J. Boukamp and D.
A. Klarner

“The General’s Interrupted Tour,” by John McClellan

“The Quadratic Formula Revisited,” by Allan W. Dickinson

“The ’12 + 1’ False Coin Problem,” by W. H. Greenblatt

“Permutation Prime Numbers,” by Alice Chamberlain Kelly

Letter to the Editor

Letter from the Editor

Problems

Rate Your Wits

Solutions to Problems

Solutions to Rate Your Wits

Late Solutions

Elementary Section

“A Dissection
Problem by Sam Lloyd,” by Harry Lindgren

“Five Rectangles
That Form a Square,” by Charles W. Trigg

“The Maxigon,” by
John McClellan

“Interesting Sums of
Two Squares,” by J. A. Hunter

Errata

# Number 2

“Number Representations and Dragon Curves – 1,” by Chandler
Davis and Donald E. Knuth

“Tetrahedron Rolled Onto a Plane,” by Charles W. Trigg

“Finite Bounds on Digital Invariants – Some Conjectures,” by
B. L. Schwartz

“Palindromic Powers,” by Gustavus J. Simmons

Letters to the Editor

Book Review

Problems

Rate Your Wits

Solutions to Problems

Late Solutions

Elementary Section

“Factors of
Repunits,” by Samuel Yates

“Heron Triangles
with Three-Digit Sides Involving Distinct Digits,” by Charles W.

Trigg

“The Cosine Rule,”
by Edward McArdle

“Integers Immune to
Partitioning into Distinct Squares,” by Charles W. Trigg

“Simultaneous 4 x 4
and 4 x 10 Pentomino Rectangles,” by C. J. Bouwkamp

“Integer Oddities,”
by J. A. H. Hunter

# Number 3

In Memorium

“Number Representatives and Dragon Curves – II,” by Chandler
Davis and Donald E. Knuth

“Hexadecimal Twin Primes,” by Leslie E. Card

“Primitive Semi-Inscribed Quadrilaterals,” by R. Robinson
Rowe

“Integer Oddities,” by J. A. H. Hunter

“Integers Expressed in Repeated Digits,” by Victor G. Feser

“Primes with 100 or More Digits – Addenda,” by Rudolf
Ondrejka

Book Review

“The First
Recreational Mathematics Book,” Underwood Dudley

Problems and Conjectures

Rate Your Wits!

Elementary Section

“The Mutuabola,” by
R. Robinson Rowe

“Right and Left
Primes,” by Murray Berg and John E. Walstrom

“Equal Products from
Integer Pairs and Their Reverses,” by Charles W. Trigg

“On a Problem of Dudeney’s,”
by Charles W. Trigg

“Representation as
Sum of Two Squares,” by J. A. H. Hunter

“Powers of Eleven by
Pascal’s Triangle,” by Barry Geldzahler

“Cyclic
Transformations – Divisibility,” by J. A. H. Hunter

“More Twin Prime
Curiosities,” by Leslie E. Card

# Number 4

“Separating Points in a Square,” by B. L. Schwartz

“Pons Asinorum,” by M. H. Greenblatt

“The Twenty Problem – A Limited Solution,” by Robert L.
Patton and Joseph S.

Madachy

“Notes on the Computer Solution of the Twenty Problem,” by
Robert L. Patton

“Full-Period Primes,” by Samuel Yates

Problems and Conjectures

Rate Your Wits

Solutions to Problems and Conjectures

“The Princess and the Roses,” by F. de Carteblanche

Solutions to Rate Your Wits

Late Solutions

“Predictive Indices to Kaprekar’s Routine,” by Charles W.
Trigg

“Triangles with Balanced Perimeters,” by Charles W. Trigg

“Curious Factorizations,” by Andrzej Makowski

65-Digit Twin Primes

Letters to the Editor

Mathematical Browsing

“Reversible Primes in Hexadecimal Form,” by Leslie E. Card

Errata

Title Page and Index for Volume 3, 1970

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