12 Days of Christmas
16th
Abundant Numbers
51st
35th
Arabic to Roman
14th
Divisors
1st
1st
Emirp Numbers
267th
74th
Evil Numbers
366th
56th
Fibonacci
163rd
7th
Fizz Buzz
54th
1st
Happy Numbers
164th
24th
Leap Years
204th
44th
Look and Say
87th
8th
Niven Numbers
178th
28th
Odious Numbers
272nd
48th
Pangram Grep
24th
Pernicious Numbers
299th
54th
Prime Numbers
144th
Quine
1st104th63rd22nd71st
Recamán
200th
17th
Roman to Arabic
38th
π
26th