12 Days of Christmas
74th
99 Bottles of Beer
81st
Abundant Numbers
62nd
Christmas Trees
38th
Cubes
16th
Diamonds
34th
Divisors
72nd
Emirp Numbers
28th
Evil Numbers
61st
Fibonacci
57th
Fizz Buzz
116th
Happy Numbers
32nd
Leap Years
91st
Morse Decoder
13th
Morse Encoder
14th
Niven Numbers
75th
Odious Numbers
62nd
Ordinal Numbers
33rd
Pangram Grep
45th
Pascal’s Triangle
30th
Pernicious Numbers
52nd
Prime Numbers
78th
Rule 110
27th
Seven Segment
14th
Sierpiński Triangle
37th
United States
λ
15th
π
34th
τ
18th
φ
20th
√2
21st
𝑒
22nd