Contents of Volume 3, "Journal of Recreational Mathematics," 1970

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