12 Days of Christmas
54th
99 Bottles of Beer
22nd
Abundant Numbers
65th
Abundant Numbers (Long)
52nd
Arabic to Roman
15th
Arithmetic Numbers
8th
Collatz
46th
Divisors
1st
Emirp Numbers
58th
Fibonacci
118th
Fizz Buzz
18th74th31st
Leap Years
33rd
Leyland Numbers
17th
Niven Numbers
485th37th
Pascal’s Triangle
34th
Pernicious Numbers
53rd
Prime Numbers
25th
Prime Numbers (Long)
1st
Van Eck Sequence
20th
π
13th