Description of certain #s
Triangular
Odd
Even
Natural
Integral
Divisible
Exponential
Square
Cubic
Factorial
Prime
Composite
Power
Unique
Divisible
Fraud Composite
Cheat Composite
Palindrome
Perfect
Amicable
Increasing Digits
Decreasing Digits
Remainder
Not divisible
In the form...x^x, etc & so on
Co-prime
Twin Prime
Mersenne Prime
Pythagorean triplets
Appreciable, etc & so on