Arabic to Roman
10th
Christmas Trees
21st
Divisors
1st
Emirp Numbers
30th
Evil Numbers
60th
Fibonacci
32nd
Fizz Buzz
61st
Happy Numbers
10th
Leap Years
38th
Niven Numbers
23rd
Odious Numbers
54th
Pangram Grep
42nd
Pascal’s Triangle
35th
Prime Numbers
32nd
Quine
30th
Sierpiński Triangle
9th
λ
9th
π
16th
τ
14th
φ
21st
√2
15th
𝑒
17th