12 Days of Christmas
            37th
                        
                    
                        
                    
        
            99 Bottles of Beer
            75th
                        
                    47th
        
            Abundant Numbers
            
                        
                    
                        
                    49th
        
            Abundant Numbers (Long)
            
                        
                    
                        
                    40th
        
            Arabic to Roman
            44th
                        
                    12th
        
            Arithmetic Numbers
            
                        
                    
                        
                    24th
        
            Arrows
            
                        
                    
                        
                    21st
        
            ASCII Table
            
                        
                    
                        
                    30th
        
            brainfuck
            23rd
                        
                    
                        
                    
        
            Catalan Numbers
            
                        
                    290th11th
        
            Catalan’s Constant
            15th
                        
                    12th
        
            Christmas Trees
            
                        
                    
                        
                    38th
        
            Collatz
            
                        
                    
                        
                    41st
        
            CSS Colors
            
                        
                    
                        
                    14th
        
            Cubes
            
                        
                    
                        
                    10th
        
            Diamonds
            25th
                        
                    
                        
                    
        
            Divisors
            65th
                        
                    56th
        
            Emirp Numbers
            
                        
                    
                        
                    26th
        
            Emirp Numbers (Long)
            
                        
                    
                        
                    18th
        
            Emojify
            
                        
                    
                        
                    16th
        
            Evil Numbers
            
                        
                    
                        
                    41st
        
            Evil Numbers (Long)
            
                        
                    
                        
                    32nd
        
            Factorial Factorisation
            
                        
                    
                        
                    14th
        
            Fibonacci
            143rd
                        
                    99th
        
            Fizz Buzz
            89th
                        
                    99th
        
            Foo Fizz Buzz Bar
            43rd
                        
                    28th
        
            Fractions
            44th
                        
                    21st
        
            Gijswijt’s Sequence
            
                        
                    
                        
                    14th
        
            Happy Numbers
            
                        
                    
                        
                    48th
        
            Happy Numbers (Long)
            
                        
                    
                        
                    26th
        
            Hexdump
            
                        
                    
                        
                    13th
        
            Intersection
            
                        
                    
                        
                    19th
        
            Inventory Sequence
            
                        
                    
                        
                    20th
        
            ISBN
            
                        
                    
                        
                    19th
        
            Kolakoski Constant
            
                        
                    
                        
                    12th
        
            Kolakoski Sequence
            21st
                        
                    
                        
                    
        
            Leap Years
            
                        
                    
                        
                    44th
        
            Leyland Numbers
            
                        
                    
                        
                    19th
        
            Look and Say
            19th
                        
                    16th
        
            Lucky Numbers
            
                        
                    
                        
                    16th
        
            Niven Numbers
            58th
                        
                    52nd
        
            Niven Numbers (Long)
            
                        
                    
                        
                    20th
        
            Number Spiral
            
                        
                    
                        
                    14th
        
            Odious Numbers
            60th
                        
                    40th
        
            Odious Numbers (Long)
            
                        
                    
                        
                    32nd
        
            Ordinal Numbers
            18th
                        
                    
                        
                    
        
            Pangram Grep
            
                        
                    
                        
                    32nd
        
            Pascal’s Triangle
            56th
                        
                    39th
        
            Pernicious Numbers
            49th
                        
                    38th
        
            Pernicious Numbers (Long)
            
                        
                    
                        
                    21st
        
            Prime Numbers
            66th
                        
                    43rd
        
            Prime Numbers (Long)
            66th
                        
                    36th
        
            Proximity Grid
            
                        
                    
                        
                    10th
        
            Quine
            
                        
                    
                        
                    65th
        
            Recamán
            
                        
                    
                        
                    28th
        
            Repeating Decimals
            
                        
                    
                        
                    8th
        
            Reverse Polish Notation
            
                        
                    
                        
                    21st
        
            Rock-paper-scissors-Spock-lizard
            
                        
                    
                        
                    19th
        
            Roman to Arabic
            17th
                        
                    
                        
                    
        
            Rule 110
            
                        
                    
                        
                    22nd
        
            Seven Segment
            
                        
                    
                        
                    26th
        
            Sierpiński Triangle
            
                        
                    
                        
                    30th
        
            Smith Numbers
            
                        
                    
                        
                    18th
        
            Spelling Numbers
            13th
                        
                    
                        
                    
        
            Sudoku
            
                        
                    
                        
                    10th
        
            Tongue-twisters
            35th
                        
                    18th
        
            United States
            
                        
                    
                        
                    16th
        
            Vampire Numbers
            
                        
                    
                        
                    14th
        
            Van Eck Sequence
            25th
                        
                    15th
        
            λ
            21st
                        
                    16th
        
            π
            30th
                        
                    19th
        
            τ
            22nd
                        
                    13th
        
            φ
            21st
                        
                    16th
        
            √2
            21st355th15th
        
            𝑒
            32nd
                        
                    23rd