12 Days of Christmas
535th
Abundant Numbers
205th
Arabic to Roman
240th
Christmas Trees
209th
Cubes
255th
Diamonds
152nd
Divisors
1st
Emirp Numbers
281st
Evil Numbers
56th1st
Fibonacci
175th160th
Fizz Buzz
58th
Happy Numbers
213th
Leap Years
220th
Morse Decoder
70th
Morse Encoder
82nd
Niven Numbers
58th39th
Odious Numbers
55th1st
Ordinal Numbers
4th
Pangram Grep
404th
Pascal’s Triangle
70th
Pernicious Numbers
393rd
Prime Numbers
246th
Quine
72nd
Rock-paper-scissors-Spock-lizard
127th
Roman to Arabic
280th
Rule 110
237th
Seven Segment
86th
Sierpiński Triangle
72nd
Spelling Numbers
187th
United States
129th
φ
174th
√2
221st