12 Days of Christmas
7th
Abundant Numbers
24th
Abundant Numbers (Long)
20th
Arabic to Roman
3rd
Catalan’s Constant
22nd
Collatz
Divisors
1st
Evil Numbers
6th
Evil Numbers (Long)
5th
Fibonacci
1st
Fizz Buzz
48th
Leap Years
30th
Look and Say
17th
Odious Numbers
6th
Odious Numbers (Long)
5th
Quine
1st
Tongue-twisters
23rd