12 Days of Christmas
81st
99 Bottles of Beer
87th
Abundant Numbers
66th
Christmas Trees
40th
Cubes
17th
Diamonds
36th
Divisors
76th
Emirp Numbers
31st
Evil Numbers
64th
Fibonacci
59th
Fizz Buzz
119th
Happy Numbers
33rd
Leap Years
100th
Morse Decoder
15th
Morse Encoder
16th
Niven Numbers
79th
Odious Numbers
65th
Ordinal Numbers
34th
Pangram Grep
49th
Pascal’s Triangle
33rd
Pernicious Numbers
60th
Prime Numbers
82nd
Rule 110
30th
Seven Segment
16th
Sierpiński Triangle
40th
United States
λ
17th
π
38th
τ
21st
φ
24th
√2
26th
𝑒
26th