12 Days of Christmas
699th
Christmas Trees
359th
Divisors
1st
Emirp Numbers
51st
Emirp Numbers (Long)
254th
Evil Numbers
1st
Evil Numbers (Long)
47th
Fibonacci
211th
Fizz Buzz
83rd20th
Foo Fizz Buzz Bar
1st
Leap Years
399th
Niven Numbers
161st
Pascal’s Triangle
226th
Prime Numbers
791st
Quine
91st
Smith Numbers
180th
π
164th
τ
139th
√2
255th