12 Days of Christmas
145th
Abundant Numbers
116th52nd
Abundant Numbers (Long)
72nd
Arabic to Roman
43rd
12th
Arithmetic Numbers
51st
Ascending Primes
3rd
Collatz
142nd
74th
Cubes
277th
Diamonds
80th
Divisors
121st71st
Emirp Numbers
51st
17th
Emirp Numbers (Long)
29th
Evil Numbers
167th
133rd
Evil Numbers (Long)
94th
37th
Factorial Factorisation
131st
Farey Sequence
165th
Fizz Buzz
156th225th1,815th
Kolakoski Sequence
38th
222nd
Leap Years
141st
ln 2
16th19th
5th
N Queens
108th
Niven Numbers
64th
Niven Numbers (Long)
52nd48th
Odious Numbers
128th
97th
Odious Numbers (Long)
80th
Prime Numbers
111th63rd
Prime Numbers (Long)
76th51st
Van Eck Sequence
24th
λ
33rd
6th
π
37th