12 Days of Christmas
877
Abundant Numbers (Long)
604307
532
Arrows
336
Christmas Trees
636
Collatz
754
CSS Colors
715
Divisors
591
Emojify
462
Fibonacci
733935
Fizz Buzz
588900487
Leap Years
400
Rock-paper-scissors-Spock-lizard
678
Roman to Arabic
517
Seven Segment
413
Tongue-twisters
642
United States
456
π
219