12 Days of Christmas
Abundant Numbers
89th
585th
Abundant Numbers (Long)
45th
337th
Arithmetic Numbers
Catalan Numbers
Christmas Trees
Collatz
Divisors
Emirp Numbers
Emirp Numbers (Long)
Evil Numbers
Evil Numbers (Long)
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
92nd
263rd
Happy Numbers
Happy Numbers (Long)
Inventory Sequence
Kolakoski Constant
Kolakoski Sequence
Leap Years
Look and Say
Lucky Numbers
Niven Numbers
43rd
56th
Niven Numbers (Long)
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
Pangram Grep
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Prime Numbers
Prime Numbers (Long)
Recamán
Sierpiński Triangle
Tongue-twisters
29th
243rd
Van Eck Sequence