12 Days of Christmas
135th
Abundant Numbers
106th45th
Abundant Numbers (Long)
64th
Arabic to Roman
41st
12th
Arithmetic Numbers
45th
Ascending Primes
3rd
Collatz
129th
270th
Cubes
245th
Diamonds
75th
Divisors
110th63rd
Emirp Numbers
47th
16th
Emirp Numbers (Long)
28th
Evil Numbers
154th
112th
Evil Numbers (Long)
84th
32nd
Factorial Factorisation
97th
Farey Sequence
140th
Fizz Buzz
147th219th1,714th
Kolakoski Sequence
37th
201st
Leap Years
132nd
ln 2
17th15th
4th
N Queens
92nd
Niven Numbers
55th
Niven Numbers (Long)
49th42nd
Odious Numbers
116th
82nd
Odious Numbers (Long)
67th
Prime Numbers
104th54th
Prime Numbers (Long)
68th44th
Van Eck Sequence
22nd
λ
32nd
5th