12 Days of Christmas
481st
Abundant Numbers
178th
Arabic to Roman
198th
Christmas Trees
184th
Cubes
233rd
Diamonds
127th
Divisors
1st
Emirp Numbers
249th
Evil Numbers
38th1st
Fibonacci
149th131st
Fizz Buzz
51st
Happy Numbers
191st
Leap Years
187th
Morse Decoder
55th
Morse Encoder
71st
Niven Numbers
41st31st
Odious Numbers
36th1st
Ordinal Numbers
4th
Pangram Grep
360th
Pascal’s Triangle
61st
Pernicious Numbers
354th
Prime Numbers
212th
Quine
56th
Rock-paper-scissors-Spock-lizard
115th
Roman to Arabic
247th
Rule 110
213th
Seven Segment
74th
Sierpiński Triangle
59th
Spelling Numbers
160th
United States
108th
φ
149th
√2
189th