12 Days of Christmas
            
                        
                    
                        
                    31st
        
            99 Bottles of Beer
            
                        
                    
                        
                    13th
        
            Abundant Numbers
            
                        
                    
                        
                    36th
        
            brainfuck
            
                        
                    
                        
                    31st
        
            Christmas Trees
            
                        
                    
                        
                    5th
        
            Cubes
            
                        
                    
                        
                    9th
        
            Diamonds
            
                        
                    
                        
                    18th
        
            Divisors
            
                        
                    
                        
                    83rd
        
            Emirp Numbers
            
                        
                    
                        
                    20th
        
            Evil Numbers
            
                        
                    
                        
                    31st
        
            Fibonacci
            
                        
                    724th1st
        
            Fizz Buzz
            
                        
                    
                        
                    133rd
        
            Happy Numbers
            
                        
                    
                        
                    21st
        
            Leap Years
            
                        
                    
                        
                    26th
        
            Morse Encoder
            
                        
                    
                        
                    9th
        
            Niven Numbers
            
                        
                    
                        
                    44th
        
            Odious Numbers
            
                        
                    
                        
                    29th
        
            Ordinal Numbers
            
                        
                    
                        
                    22nd
        
            Pangram Grep
            
                        
                    
                        
                    
                        
                    
        
            Pascal’s Triangle
            
                        
                    
                        
                    23rd
        
            Pernicious Numbers
            
                        
                    
                        
                    32nd
        
            Prime Numbers
            
                        
                    
                        
                    39th
        
            Quine
            
                        
                    
                        
                    1st
        
            Rock-paper-scissors-Spock-lizard
            
                        
                    
                        
                    10th
        
            Roman to Arabic
            
                        
                    
                        
                    
                        
                    
        
            Rule 110
            
                        
                    
                        
                    12th
        
            Seven Segment
            
                        
                    
                        
                    12th
        
            Sierpiński Triangle
            
                        
                    
                        
                    22nd
        
            λ
            
                        
                    
                        
                    7th
        
            π
            53rd
                        
                    14th
        
            τ
            
                        
                    
                        
                    9th
        
            φ
            
                        
                    
                        
                    16th
        
            √2
            
                        
                    
                        
                    8th
        
            𝑒
            
                        
                    
                        
                    14th