12 Days of Christmas
236th
99 Bottles of Beer
131st
Christmas Trees
57th
Divisors
1st
Emirp Numbers
88th
Evil Numbers
108th
Fibonacci
148th
Fizz Buzz
49th
Happy Numbers
203rd
Leap Years
378th
Niven Numbers
261st
Odious Numbers
130th
Pascalβs Triangle
104th
Pernicious Numbers
130th
Prime Numbers
279th
Quine
55th