12 Days of Christmas
12th99 Bottles of Beer
8thAbundant Numbers
9thChristmas Trees
4thCubes
4thDiamonds
7thDivisors
17thEmirp Numbers
7thEmojify
2ndEvil Numbers
12thFizz Buzz
13thHappy Numbers
7thIntersection
5thLeap Years
16thLeyland Numbers
4thLook and Say
6thLucky Tickets
4thMorse Decoder
3rdMorse Encoder
3rdNiven Numbers
18thOdious Numbers
12thOrdinal Numbers
5thPangram Grep
11thPascal’s Triangle
31stPernicious Numbers
18thPoker
2ndPrime Numbers
13thRecamán
7thRock-paper-scissors-Spock-lizard
3rdRoman to Arabic
14thRule 110
5thSeven Segment
7thSpelling Numbers
4thTongue-twisters
12thUnited States
4th