Natural Numbers
The number devil
Hans Magnus Enzensberger
7 ate 9
Tara Lazar
Zero the hero
Joan Holub
Missing Mittens (MathStart 1)
Stuart J. Murphy
Spinderella
Julia Donaldson
A handbook of integer sequences
Neil J. A. Sloane
The Wing Wing brothers math spectacular!
Ethan Long
Bears Odd, Bears Even
Harriet Ziefert
The Guinness book of numbers
Adrian Room
Scooby-Doo! an even or odd mystery
Mark Weakland
Multiplying menace
Pam Calvert
Route 1-2-3
Kent Salisbury
Basic College Mathematics with Early Integers
K. Elayn Martin-Gay
Missing math
Loreen Leedy
Napier's bones
Derryl Murphy
Harmonikale Faszination
Rudolf Stössel
Max's math
Kate Banks
Ces nombres qui nous fascinent
J. M. de Koninck
Mr. Mac-A-Doodle, you're a genius
Marian Frances
Die Reihe der natürlichen Zahlen als Geist-Kunstwerk
Louis Locher-Ernst
Notes on sums of squares of consecutive odd integers
W. Sollfrey
The encyclopedia of integer sequences
Neil J. A. Sloane
Never forget a number or date
Dominic O'Brien
Numbers
Henry Pluckrose
Among the odds & evens
Priscilla Turner
How to Multiply, Grades 3-4
Robert W. Smith
Prime period lengths
Samuel Yates
Liczby naturalne i funkcje obliczalne
Andrzej Mostowski
Enciclopedia matematică a claselor de numere întregi
Marius Coman
123
Shu zi =
Math Attack
Joan Horton
Moonchap (Flying Foxes)
Mary Murphy
Odd And Even Socks (Rookie Read-About Math)
Melanie Chrismer
Basic College Mathematics with Early Integers (Martin-Gay Developmental Math Series)
K. Elayn Martin-Gay
Numbers on the farm
Stephen Holmes
Planning for learning through numbers
Jenni Clarke
I Like Numbers! (Chalk It Up to Learning) (Chalk It Up to Learning)
Stephanie Weeks
Seven ate Nine!
David Michael Slater
The number of unitary, square-free divisors of an integer I-II.
D. Suryanarayana