12 Days of Christmas
13th
99 Bottles of Beer
8th
Abundant Numbers
10th
Christmas Trees
4th
Cubes
4th
Diamonds
7th
Divisors
24th
Emirp Numbers
8th
Emojify
2nd
Evil Numbers
15th
Fizz Buzz
16th
Happy Numbers
8th
Intersection
5th
Leap Years
19th
Leyland Numbers
4th
Look and Say
6th
Lucky Tickets
4th
Morse Decoder
3rd
Morse Encoder
3rd
Niven Numbers
25th
Odious Numbers
15th
Ordinal Numbers
5th
Pangram Grep
10th
Pascal’s Triangle
45th
Pernicious Numbers
23rd
Poker
2nd
Prime Numbers
13th
Recamán
8th
Rock-paper-scissors-Spock-lizard
4th
Roman to Arabic
20th
Rule 110
5th
Seven Segment
7th
Spelling Numbers
4th
Tongue-twisters
19th
United States
8th