12 Days of Christmas
528th
Abundant Numbers
230th
Arabic to Roman
232nd
Christmas Trees
230th
Cubes
231st
Diamonds
158th
Divisors
106th
Emirp Numbers
77th
Evil Numbers
42nd1st
Fibonacci
155th138th
Fizz Buzz
191st
Happy Numbers
226th
Leap Years
104th
Morse Decoder
76th
Morse Encoder
88th
Niven Numbers
43rd33rd
Odious Numbers
40th1st
Ordinal Numbers
80th
Pangram Grep
384th
Pascal’s Triangle
97th
Pernicious Numbers
242nd
Prime Numbers
227th
Quine
63rd
Rock-paper-scissors-Spock-lizard
134th
Roman to Arabic
270th
Rule 110
219th
Seven Segment
115th
Sierpiński Triangle
84th
Spelling Numbers
175th
United States
147th
φ
184th
√2
227th