12 Days of Christmas
887
Abundant Numbers (Long)
643333
554
Arrows
345
Christmas Trees
646
Collatz
829
CSS Colors
389
Divisors
600
Emojify
471
Fibonacci
857
Fizz Buzz
619906527
Leap Years
406
Rock-paper-scissors-Spock-lizard
687
Roman to Arabic
533
Seven Segment
427
Tongue-twisters
646
United States
214
π
224