12 Days of Christmas
491st
Abundant Numbers
182nd
Arabic to Roman
212th
Christmas Trees
189th
Cubes
238th
Diamonds
134th
Divisors
1st
Emirp Numbers
258th
Evil Numbers
40th1st
Fibonacci
152nd136th
Fizz Buzz
53rd
Happy Numbers
193rd
Leap Years
196th
Morse Decoder
59th
Morse Encoder
71st
Niven Numbers
42nd32nd
Odious Numbers
39th1st
Ordinal Numbers
4th
Pangram Grep
369th
Pascal’s Triangle
63rd
Pernicious Numbers
365th
Prime Numbers
222nd
Quine
58th
Rock-paper-scissors-Spock-lizard
118th
Roman to Arabic
257th
Rule 110
221st
Seven Segment
76th
Sierpiński Triangle
60th
Spelling Numbers
167th
United States
115th
φ
155th
√2
197th