Abundant Numbers
163rd
70th
Abundant Numbers (Long)
88th
57th
Arabic to Roman
39th
Arithmetic Numbers
63rd
42nd
Billiards
6th
Christmas Trees
28th
Collatz
163rd
59th
Cubes
19th
Diamonds
34th
Divisors
225th
77th
Evil Numbers
81st
Evil Numbers (Long)
62nd
Fibonacci
330th88th128th1,047th
Fizz Buzz
532nd
240th
Happy Numbers
35th
Leap Years
197th
55th410th
Niven Numbers
126th
61st
Niven Numbers (Long)
66th
55th
Number Spiral
20th
Odious Numbers
139th
64th
Odious Numbers (Long)
52nd
Pascal’s Triangle
40th
Prime Numbers
72nd
Prime Numbers (Long)
68th
Roman to Arabic
25th
Sierpiński Triangle
32nd
Smith Numbers
30th
24th
Tongue-twisters
39th