12 Days of Christmas
6th
Abundant Numbers
21st
Abundant Numbers (Long)
18th
Arabic to Roman
2nd
Catalan’s Constant
22nd
Collatz
Divisors
1st
Evil Numbers
6th
Evil Numbers (Long)
4th
Fibonacci
1st
Fizz Buzz
48th
Leap Years
29th
Look and Say
17th
Odious Numbers
6th
Odious Numbers (Long)
4th
Quine
1st
Tongue-twisters
22nd