12 Days of Christmas
14th
Abundant Numbers
41st
31st
Arabic to Roman
11th
Divisors
1st
1st
Emirp Numbers
230th
69th
Evil Numbers
303rd
52nd
Fibonacci
130th
6th
Fizz Buzz
46th
1st
Happy Numbers
138th
20th
Leap Years
169th
38th
Look and Say
70th
7th
Niven Numbers
146th
23rd
Odious Numbers
214th
42nd
Pangram Grep
20th
Pernicious Numbers
249th
46th
Prime Numbers
120th
20th
Quine
1st
79th
52nd
18th
59th
RecamΓ‘n
163rd
14th
Roman to Arabic
33rd
Ο
23rd