Abundant Numbers
619
612
605
769
Arrows
Collatz
CSS Colors
Emirp Numbers
Evil Numbers
Fibonacci
Fizz Buzz
753
Foo Fizz Buzz Bar
749
Fractions
Happy Numbers
Happy Numbers (Long)
ISBN
Niven Numbers
549
Odious Numbers
Ordinal Numbers
Pangram Grep
Pernicious Numbers
Prime Numbers
Prime Numbers (Long)
Quine
RecamΓ‘n
Smith Numbers
Tongue-twisters
586
United States
β2
π