12 Days of Christmas
Abundant Numbers
175th
brainfuck
Catalan Numbers
Christmas Trees
Collatz
Cubes
Diamonds
Divisors
258th
Emirp Numbers
Evil Numbers
193rd
76th
Fibonacci
379th
119th
76th
140th
59th
104th
830th
Fizz Buzz
Fractions
71st
36th
Happy Numbers
87th
Happy Numbers (Long)
Leap Years
Leyland Numbers
Look and Say
Niven Numbers
Odious Numbers
150th
Pascal’s Triangle
Pernicious Numbers
93rd
Prime Numbers
223rd
73rd
43rd
102nd
Quine
Recamán
Reverse Polish Notation
Roman to Arabic
Rule 110
Sierpiński Triangle
Smith Numbers
Sudoku
Sudoku (Fill-in)
Van Eck Sequence
√2