**Contents of Journal of Recreational Mathematics Volume 7**

This volume was
published as one book containing all four issues.

“The Unknown World of Octiamonds,” by Ir P. J.
Torbijin

“Trimagic Squares,” by Willam H, Benson

“Perimeter-Magic Polygons,” by Terrel Trotter Jr.

“A Third-Order Square Related to Magic Squares,” by
Charles W. Trigg

“Art and Mathematics of String Figures,” ALi R.
AMir-Moez and J. D. Hamilton

“An Optical Illusion,” John McClellan

“The Stacked Playing Cards,” Robert E. Parkin

“Second- and Third-Order Multi-Multigrades,” by Donald
Cross

“The Quadrangle Game,” by Jorgen Lou

“Eight Digits on a Cube’s Vertices,” by Charles W.
Trigg

“The Duration of BINGO Games,” by Ronald Lessing

Letters to the Editor

Problems and Conjectures

Note From the Editor

Late Solutions

Alphametics

Solutions to Problems, Conjectures and Alphametics

The Solvers’ List

Errata

Index for Volume 6

“714 and 715,” by Carol Nelson, David E. Penner and
Carl Pomerance

“Exploded Myths,” by Joseph Arkin and V. E. Hoggatt,
Jr.

“Pan-N-Agonals in Hypercubes,” by John Robert
Hendricks

“Every Magic Square is Not a Latin Square,” by Joseph
M. Moser

“Some Properties of Third-Order Magic Squares,” by
Charles W. Trigg

“Triangular Arrangements of Disks in Order of
Magnitude,” by Charles W. Trigg

“Hippocrates,” by Ali R. Amir-Moez and J. D. Hamilton

“Knight Interchanges,” by Robert E. Parkin

“The ‘Prime Derivative’,” by Perry Dane

“The Tower of Brahma Revisited,” by Ted Roth

“Consecutive Hypotenuses of Pythagorean Triangles,” by
Albert H. Beiler

“The Additive Persistence of a Number,” by Harvey J.
Hindin

“Nine-Digit Determinants Equal to Their First Rows,”
by Charles W. Trigg

“Semandic Paradoxes,” by Phillip Shultz

Book Review

“Figures, Figures,” by J. A. H. Hunter

Problems and Conjectures

Alphametics

“Find the Next Term,” by N. J. A. Sloane

Solutions to Problems and Conjectures

Late Solutions

“Trimorphic Numbers,” by J. A. Hunter

“Essentially Different Nonattacking Rook
Arrangements,” by Loren C. Larson

“Third-Order Multi-Multigrades from Sums of Two
Squares,” Donald Cross

“A Pandiagonal Magic Square of Order Eight,” by John
Robert Hendricks

“Magic Square Time,” by John Robert Hendricks

“A Winning Opening in Reverse Hex,” by Ronald Evans

“A Winning Strategy for SIM,” by E. M. Rounds and S.
S. Yau

“Geometric Representation of the Sequence (3, 7, 13,
21, 31, 43, 57, . . .),” by George Berzsenyi

“More Geometric Dissections,” by Greg Frederickson

“Mathematical Oddballs,” by William L. Schaaf

“Single Vacancy Rolling Cube Problems,” by John W.
Harris

“The Lucky Languages,” by Sidney Kravitz

“Packing a Square With Y-Pentominoes,” by Jenifer
Haselgrove

“A Polygonal Number Relationship,” by Harvey J. Hindin

“The Famous-Name Game,” by Charles W. Trigg

“The Stamp Problem,” by R. L. Heimer and H. Langenbach

Alphametics

Problems and Conjectures

Errata

“Storming the Stairway of Squares,” by William Raymond
Griffin

“Aspects of 1974,” by Charles W. Trigg

“Covering Cubes With MacMahon’s Three-Color Squares,”
by Wade E. Philpott

“Tiling 5n x 12 Rectangles with Y-Pentominoes,” by
James Bitner

“Solid Pentomino Multiplications,” by Ad Mank

“True Odds for a Certain Game,” by H. M. Finucan and
A. S. Jones

“Digital Fractions,” by H. T. Huang

“Fractured Fractions,” by Steven Kahan

“A New Function From a Table of Primes,” by James R.
Smart

“The Roses and the Princes,” F. deCarte Blanche

“Looking-Glass Numbers,” by Cedric A. B. Smith

Letters to the Editor

“Some Ideas About the Solution of Cryptarithmetic
Puzzles,” by Nichola V. Findler and Paul Bunting

Problems and Conjectures, edited by David L. Silverman

Alphametics, edited by J. A. H. Hunter

Solutions to Problems and Conjectures

Errata

Late Solutions

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