Welcome to the Number Dictionary!

This website is an informational resource for the fascinating properties of numbers and numeral systems.


Representation
numerals
Numeral
systems
Multi-Polygonal
numbers
Special
numbers
Sums
& other
Greek
Arabic
Roman
Maya
Chinese
Hebrew
Binary
Septimal
Octal
Hexadecimal
Base
Triangular
Square
Pentagonal
Hexagonal
Heptagonal
Octogonal
Primes
Twin primes
Gaussian primes
Fibonacci
Perfect
Palindromic
Layland
Goldbach pairs
Sum of 2 squares
Difference of 2 squares
Sum of all divisors
Divisors
Factorization

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