12 Days of Christmas
49th
99 Bottles of Beer
49th
Abundant Numbers
55th
Arrows
40th
CSS Colors
28th
Diamonds
150th
Divisors
81st
Emirp Numbers
16th
Evil Numbers
70th
120th
Fibonacci
163rd
163rd
Fizz Buzz
207th
1st
196th
Happy Numbers
17th
42nd
Leap Years
155th71st
31st
48th97th
49th
301st
Leyland Numbers
19th
Lucky Tickets
19th
Morse Decoder
47th
Morse Encoder
42nd
Niven Numbers
1st
127th
Odious Numbers
68th
273rd
Ordinal Numbers
66th
Pangram Grep
Pascal’s Triangle
62nd
Pernicious Numbers
60th
146th
Prime Numbers
1st
325th
Quine
1st25th99th1st80th25th53rd118th4th56th29th1st1st43rd117th46th36th63rd42nd99th
Rule 110
56th
Seven Segment
79th
Spelling Numbers
18th
United States
λ
44th
26th
35th45th39th145th14th
π
46th
τ
47th
φ
67th
√2
76th
𝑒
79th