12 Days of Christmas
50th
99 Bottles of Beer
49th
Abundant Numbers
56th
Arrows
40th
CSS Colors
28th
Diamonds
156th
Divisors
83rd
Emirp Numbers
16th
Evil Numbers
73rd
126th
Fibonacci
168th
173rd
Fizz Buzz
210th
1st
202nd
Happy Numbers
17th
43rd
Leap Years
156th72nd
33rd
51st98th
50th
308th
Leyland Numbers
19th
Lucky Tickets
19th
Morse Decoder
48th
Morse Encoder
42nd
Niven Numbers
1st
132nd
Odious Numbers
71st
285th
Ordinal Numbers
68th
Pangram Grep
Pascal’s Triangle
63rd
Pernicious Numbers
61st
149th
Prime Numbers
1st
334th
Quine
1st25th99th1st80th25th56th118th4th63rd30th1st1st44th117th47th36th67th42nd99th
Rule 110
57th
Seven Segment
79th
Spelling Numbers
18th
United States
λ
45th
26th
36th45th40th149th14th
π
49th
τ
49th
φ
71st
√2
81st
𝑒
85th