12 Days of Christmas
            78th
        
            99 Bottles of Beer
            82nd
        
            Abundant Numbers
            61st
        
            Christmas Trees
            37th
        
            Cubes
            17th
        
            Diamonds
            32nd
        
            Divisors
            70th
        
            Emirp Numbers
            28th
        
            Evil Numbers
            59th
        
            Fibonacci
            48th
        
            Fizz Buzz
            115th
        
            Happy Numbers
            31st
        
            Leap Years
            88th
        
            Morse Decoder
            13th
        
            Morse Encoder
            15th
        
            Niven Numbers
            70th
        
            Odious Numbers
            61st
        
            Ordinal Numbers
            32nd
        
            Pangram Grep
            43rd
        
            Pascal’s Triangle
            29th
        
            Pernicious Numbers
            52nd
        
            Prime Numbers
            72nd
        
            Rule 110
            26th
        
            Seven Segment
            14th
        
            Sierpiński Triangle
            38th
        
            United States
            
                        
                    
        
            λ
            15th
        
            π
            31st
        
            τ
            17th
        
            φ
            19th
        
            √2
            19th
        
            𝑒
            20th