12 Days of Christmas
73rd
99 Bottles of Beer
79th
Abundant Numbers
60th
Christmas Trees
37th
Cubes
16th
Diamonds
31st
Divisors
69th
Emirp Numbers
28th
Evil Numbers
58th
Fibonacci
48th
Fizz Buzz
115th
Happy Numbers
31st
Leap Years
87th
Morse Decoder
13th
Morse Encoder
14th
Niven Numbers
69th
Odious Numbers
59th
Ordinal Numbers
32nd
Pangram Grep
43rd
Pascal’s Triangle
29th
Pernicious Numbers
50th
Prime Numbers
72nd
Rule 110
26th
Seven Segment
13th
Sierpiński Triangle
37th
United States
λ
14th
π
30th
τ
16th
φ
18th
√2
18th
𝑒
18th