12 Days of Christmas
881
Abundant Numbers (Long)
603307
541
Arrows
336
Christmas Trees
636
Collatz
754
CSS Colors
714
Divisors
591
Emojify
462
Fibonacci
733935
Fizz Buzz
589900487
Leap Years
400
Rock-paper-scissors-Spock-lizard
678
Roman to Arabic
516
Seven Segment
417
Tongue-twisters
642
United States
456
π
219