12 Days of Christmas
49th
99 Bottles of Beer
49th
Abundant Numbers
55th
Arrows
40th
CSS Colors
28th
Diamonds
153rd
Divisors
81st
Emirp Numbers
16th
Evil Numbers
72nd
121st
Fibonacci
164th
166th
Fizz Buzz
207th
1st
201st
Happy Numbers
17th
42nd
Leap Years
155th71st
31st
48th97th
49th
305th
Leyland Numbers
19th
Lucky Tickets
19th
Morse Decoder
47th
Morse Encoder
42nd
Niven Numbers
1st
129th
Odious Numbers
70th
276th
Ordinal Numbers
67th
Pangram Grep
Pascal’s Triangle
62nd
Pernicious Numbers
60th
147th
Prime Numbers
1st
329th
Quine
1st25th99th1st80th25th54th118th4th56th29th1st1st43rd117th47th36th63rd42nd99th
Rule 110
56th
Seven Segment
79th
Spelling Numbers
18th
United States
λ
45th
26th
36th45th40th147th14th
π
47th
τ
48th
φ
68th
√2
79th
𝑒
80th