12 Days of Christmas
518th
Abundant Numbers
195th
Arabic to Roman
227th
Christmas Trees
197th
Cubes
248th
Diamonds
146th
Divisors
1st
Emirp Numbers
268th
Evil Numbers
43rd1st
Fibonacci
157th144th
Fizz Buzz
54th
Happy Numbers
201st
Leap Years
206th
Morse Decoder
61st
Morse Encoder
75th
Niven Numbers
46th35th
Odious Numbers
41st1st
Ordinal Numbers
4th
Pangram Grep
382nd
Pascal’s Triangle
70th
Pernicious Numbers
381st
Prime Numbers
234th
Quine
63rd
Rock-paper-scissors-Spock-lizard
120th
Roman to Arabic
268th
Rule 110
230th
Seven Segment
81st
Sierpiński Triangle
66th
Spelling Numbers
179th
United States
122nd
φ
165th
√2
209th