Abundant Numbers
10th
Abundant Numbers (Long)
2nd
Arithmetic Numbers
27th
Catalan Numbers
25th
Collatz
32nd
Divisors
45th34th
Evil Numbers
39th
149th
Evil Numbers (Long)
48th
Fibonacci
121st
Fizz Buzz
11th3rd
Foo Fizz Buzz Bar
30th
Happy Numbers
28th
Happy Numbers (Long)
19th
Leap Years
74th
Leyland Numbers
27th
Niven Numbers
77th
Niven Numbers (Long)
43rd
Odious Numbers
53rd23rd507th
Odious Numbers (Long)
41st
Pascal’s Triangle
39th53rd
Pernicious Numbers
49th
Prime Numbers
47th
Prime Numbers (Long)
38th
Recamán
22nd
Smith Numbers
26th
Sudoku
11th
Van Eck Sequence
19th