12 Days of Christmas
161st
Christmas Trees
30th
Divisors
134th
Emirp Numbers
81st
Evil Numbers
221st
Fibonacci
314th59th
1,078th
Fizz Buzz
188th
21st
Happy Numbers
96th
Leap Years
136th
Niven Numbers
163rd
Odious Numbers
169th
Prime Numbers
125th55th14th1,110th
Prime Numbers (Long)
14th
Quine
65th
63rd
ROT13
41st
8th
π
83rd