12 Days of Christmas
141st
Abundant Numbers
107th46th
Abundant Numbers (Long)
65th
Arabic to Roman
41st
12th
Arithmetic Numbers
45th
Ascending Primes
3rd
Collatz
137th
286th
Cubes
256th
Diamonds
78th
Divisors
113th67th
Emirp Numbers
48th
16th
Emirp Numbers (Long)
28th
Evil Numbers
155th
120th
Evil Numbers (Long)
86th
33rd
Factorial Factorisation
108th
Farey Sequence
156th
Fizz Buzz
153rd222nd1,749th
Kolakoski Sequence
38th
209th
Leap Years
136th
ln 2
17th15th
4th
N Queens
99th
Niven Numbers
59th
Niven Numbers (Long)
51st46th
Odious Numbers
118th
85th
Odious Numbers (Long)
70th
Prime Numbers
107th57th
Prime Numbers (Long)
71st44th
Van Eck Sequence
22nd
λ
32nd
5th
π
34th