12 Days of Christmas
50th
99 Bottles of Beer
50th
Abundant Numbers
57th
Arrows
40th
CSS Colors
28th
Diamonds
161st
Divisors
85th
Emirp Numbers
16th
Evil Numbers
74th
130th
Fibonacci
169th
178th
Fizz Buzz
212th
1st
204th
Happy Numbers
17th
47th
Leap Years
159th73rd
33rd
58th101st
50th
311th
Leyland Numbers
19th
Lucky Tickets
19th
Morse Decoder
48th
Morse Encoder
42nd
Niven Numbers
1st
136th
Odious Numbers
73rd
290th
Ordinal Numbers
68th
Pangram Grep
Pascal’s Triangle
66th
Pernicious Numbers
62nd
154th
Prime Numbers
1st
338th
Quine
1st25th102nd1st80th25th57th120th4th65th30th1st1st45th118th48th35th67th43rd107th
Rule 110
57th
Seven Segment
81st
Spelling Numbers
18th
United States
λ
45th
26th
37th45th40th148th14th
π
50th
τ
49th
φ
72nd
√2
82nd
𝑒
86th