12 Days of Christmas
518th
Abundant Numbers
229th
Arabic to Roman
229th
Christmas Trees
226th
Cubes
228th
Diamonds
155th
Divisors
104th
Emirp Numbers
77th
Evil Numbers
41st1st
Fibonacci
155th138th
Fizz Buzz
188th
Happy Numbers
220th
Leap Years
103rd
Morse Decoder
74th
Morse Encoder
87th
Niven Numbers
43rd32nd
Odious Numbers
39th1st
Ordinal Numbers
80th
Pangram Grep
378th
Pascal’s Triangle
95th
Pernicious Numbers
240th
Prime Numbers
223rd
Quine
59th
Rock-paper-scissors-Spock-lizard
133rd
Roman to Arabic
265th
Rule 110
217th
Seven Segment
112th
Sierpiński Triangle
81st
Spelling Numbers
175th
United States
141st
φ
181st
√2
223rd