12 Days of Christmas
552nd
Abundant Numbers
208th
Arabic to Roman
242nd
Christmas Trees
213th
Cubes
256th
Diamonds
156th
Divisors
1st
Emirp Numbers
281st
Evil Numbers
56th1st
Fibonacci
180th163rd
Fizz Buzz
58th
Happy Numbers
214th
Leap Years
221st
Morse Decoder
70th
Morse Encoder
83rd
Niven Numbers
58th39th
Odious Numbers
55th1st
Ordinal Numbers
4th
Pangram Grep
407th
Pascal’s Triangle
72nd
Pernicious Numbers
398th
Prime Numbers
249th
Quine
72nd
Rock-paper-scissors-Spock-lizard
127th
Roman to Arabic
282nd
Rule 110
241st
Seven Segment
88th
Sierpiński Triangle
72nd
Spelling Numbers
191st
United States
131st
φ
175th
√2
224th