99 Bottles of Beer
30th
Divisors
238th75th
Emirp Numbers
41st
Evil Numbers
126th75th
Fibonacci
407th154th
Fizz Buzz
468th135th
Happy Numbers
67th
Leap Years
168th60th
Niven Numbers
137th92nd
Odious Numbers
108th64th
Pascal’s Triangle
111th46th
Pernicious Numbers
31st
Prime Numbers
270th83rd
Roman to Arabic
32nd
Rule 110
47th
Spelling Numbers
15th
√2
26th