Arabic to Roman
10th
Christmas Trees
21st
Divisors
1st
Emirp Numbers
30th
Evil Numbers
58th
Fibonacci
31st
Fizz Buzz
57th
Happy Numbers
12th
Leap Years
37th
Niven Numbers
23rd
Odious Numbers
53rd
Pangram Grep
40th
Pascal’s Triangle
35th
Prime Numbers
30th
Quine
28th
Sierpiński Triangle
8th
λ
10th
π
15th
τ
13th
φ
19th
√2
14th
𝑒
16th