12 Days of Christmas
16th
99 Bottles of Beer
10th
Abundant Numbers
13th
Christmas Trees
5th
Cubes
5th
Diamonds
9th
Divisors
26th
Emirp Numbers
9th
Emojify
4th
Evil Numbers
19th
Fizz Buzz
18th
Happy Numbers
11th
Intersection
8th
Leap Years
21st
Leyland Numbers
5th
Look and Say
8th
Lucky Tickets
6th
Morse Decoder
4th
Morse Encoder
4th
Niven Numbers
28th
Odious Numbers
19th
Ordinal Numbers
7th
Pangram Grep
12th
Pascal’s Triangle
52nd
Pernicious Numbers
29th
Poker
3rd
Prime Numbers
17th
Recamán
10th
Rock-paper-scissors-Spock-lizard
5th
Roman to Arabic
25th
Rule 110
7th
Seven Segment
10th
Spelling Numbers
5th
Tongue-twisters
21st
United States
15th