12 Days of Christmas
552nd
Abundant Numbers
245th
Arabic to Roman
248th
Christmas Trees
241st
Cubes
239th
Diamonds
171st
Divisors
114th
Emirp Numbers
80th
Evil Numbers
51st1st
Fibonacci
168th154th
Fizz Buzz
204th
Happy Numbers
234th
Leap Years
110th
Morse Decoder
83rd
Morse Encoder
97th
Niven Numbers
55th36th
Odious Numbers
51st1st
Ordinal Numbers
86th
Pangram Grep
402nd
Pascal’s Triangle
101st
Pernicious Numbers
256th
Prime Numbers
242nd
Quine
67th
Rock-paper-scissors-Spock-lizard
140th
Roman to Arabic
282nd
Rule 110
227th
Seven Segment
121st
Sierpiński Triangle
89th
Spelling Numbers
188th
United States
154th
φ
197th
√2
242nd