12 Days of Christmas
24th
99 Bottles of Beer
33rd
Abundant Numbers
18th
Arabic to Roman
24th
Christmas Trees
10th
Divisors
19th
Emirp Numbers
22nd
Evil Numbers
51st
Fibonacci
1st
Fizz Buzz
44th
Foo Fizz Buzz Bar
16th
Happy Numbers
51st
Leap Years
22nd
Niven Numbers
31st
Odious Numbers
49th
Ordinal Numbers
20th
Pangram Grep
9th
Pascal’s Triangle
34th
Pernicious Numbers
40th
Prime Numbers
42nd
Roman to Arabic
13th
Seven Segment
17th
Spelling Numbers
United States
23rd
λ
13th
π
26th
τ
19th
φ
32nd
√2
38th
𝑒
25th