12 Days of Christmas
882
Abundant Numbers (Long)
643333
545
Arrows
345
Christmas Trees
646
Collatz
768
CSS Colors
747
Divisors
600
Emojify
471
Fibonacci
784947
Fizz Buzz
619906511
Leap Years
406
Rock-paper-scissors-Spock-lizard
687
Roman to Arabic
533
Seven Segment
423
Tongue-twisters
646
United States
465
π
224