12 Days of Christmas
51st
99 Bottles of Beer
50th
Abundant Numbers
58th
Arrows
40th
CSS Colors
28th
Diamonds
163rd
Divisors
86th
Emirp Numbers
16th
Evil Numbers
75th
134th
Fibonacci
174th
184th
Fizz Buzz
215th
1st
209th
Happy Numbers
17th
49th
Leap Years
162nd75th
35th
57th103rd
50th
319th
Leyland Numbers
20th
Lucky Tickets
23rd
Morse Decoder
49th
Morse Encoder
43rd
Niven Numbers
1st
141st
Odious Numbers
74th
298th
Ordinal Numbers
68th
Pangram Grep
Pascal’s Triangle
66th
Pernicious Numbers
62nd
157th
Prime Numbers
1st
342nd
Quine
1st25th103rd1st82nd25th60th120th5th66th30th1st1st45th118th48th36th72nd43rd110th
Rule 110
59th
Seven Segment
82nd
Spelling Numbers
18th
United States
λ
48th
26th
38th46th41st151st15th
π
51st
τ
49th
φ
72nd
√2
84th
𝑒
86th