Contents of Volume 23,

**Journal of Recreational Mathematics**# Number 1

“Is the Great One Slipping? Not on the Ice,” by Robert J.
Downs and Paul M. Sommers

Letter to the Editor

“A Prime Gap of 784,” by Sol Wientraub

“Five-Digit Primes with Centrally Imbedded Repdigits,” by
Charles W. Trigg

Letter to the Editor

“Products of Repdigit-9 Multipliers,” by John Caffrey

“Welcome Back, Dr. Matrix,” by Samuel Yates

“Tables of Square Palindromes in Bases 2 and 10,” by J.
Keith Barnett

“Sign In Please!” by Steven Kahan

“Triangular Solitaire,” by John Duncan and Donald Hayes

Letter to the Editor

“Pat Hands – A Progress Report,” by Benjamin L. Schwartz

“In Honor of Maria Agnesi,” by Hyman Gabai

“Prime Concatenations by N and N + 1,” by Charles W. Trigg

“A New Method for Finding Prime-Rich Equations of the Type
x^2 – x + c,” by Robert S. Sery

Book Reviews, edited by Samuel Yates

Alphametics and Solutions to 22(1) Alphametics, edited by
Steven Kahan

“BASIC,” by Hyman Gabai

Problems and Conjectures, edited by Joseph S. Madachy

Solutions to Problems and Conjectures

Solvers’ List

# Number 2

“A PROLOG Mastermind Program,” by Antonio M. Lopez, Jr.

“Properties of the Prime-Number Triplets and Quadruplets,”
by R. M. Sternheimer

“1991 – The Palindrome of the Century,” by Mary M. Sullivan

“Triangular Peg Solitaire on a Microcomputer,” by William A.
Miller

“Teaching Trigonometry to Wicker Furniture,” by Elizabeth
Anne Viau

“Ode to the Golden Triangle,” by Keith Ferland

“Pat Hands Completed,” by Benjamin L. Schwartz

“Women Mathematicians,” by Hyman Gabai

Book Reviews, edited by Samuel Yates

Samuel Yates (1919 – 1991)

Alphametics and Solutions to 22(2) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Joseph S. Madachy

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

Errata

Solvers’ List

# Number 3

“A Catalog of Symmetric Self-Similar Space-Filling Curves,”
by Yoshio Ohno and Koichi Ohyama

“The Secret of Franklin’s 8 x 8 ‘Magic’ Square,” by Lalbhai
D. Patel

“Young Archimedes,” by Hyman Gabai

“Magic Squares, Matrices, Planes and Angles,” by Frank E.
Hruska

“Minimum Prime Pandiagonal Order-6 Magic Squares,” by Allan
William Johnson, Jr.

“Variations on Trigg’s Constant,” by John Caffrey

“The Discovery of Calculus,” by Hyman Gabai

“Prime-Rank Concatenated Primes,” by Charles W. Trigg

“Rank-Prime Concatenated Primes,” by Charles W. Trigg

“Continued Roots in the Complex Plane,” by Clifford A.
Pickover and Akhlesh Lakhtakia

“The Algebraists,” by Hyman Gabai

“Products of Repdigit-3 and Repdigit-6 Multipliers,” by John
Caffrey

“Progress in Arithmetic,” by Hyman Gabai

“The 31 Game,” by Harold Newman

“The Ultimate Computer,” by Hyman Gabai

Letter to the Editor

Book Reviews

Alphametics and Solutions to 22(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

# Number 4

“On the Probabilities of Some Unusual Birthdays,” by R. M.
Sternheimer

“Some Results on Digit Sum Sequences,” by Chris Long

“Nine-Digit Equations,” by Charles W. Trigg

“A Catalog of Non-Symmetric Self-Similar Space-Filling
Curves,” by Yoshio Ohno and Koichi Ohyama

“Solution to Nine-Digit Equations”

“Solutions to the N x N Knights Cover Problem,” by Anderson
H. Jackson and Roy P. Pargas

“On Palindromic Numbers and Their Divisibility by 11,” by R.
M. Sternheimer

“Are There Pay Differentials in the Major Leagues? Some
Ballpark Figures,” by Paul M. Sommers

“Some Special Second-Order Determinants,” by Charles W.
Trigg

“Curiosa Involving the First Ten Perfect Numbers,” by
Charles W. Trigg

Book Reviews, edited by Joseph S. Madachy

Alphametics and Solutions to 22(4) Alphametics, edited by
Steven Kahan

Problems and Conjectures, edited by Joseph S. Madachy

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

Letter to the Editor, by Palmer O. Hanson, Jr.

Solvers’ List

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