12 Days of Christmas
712
Abundant Numbers (Long)
589303
476
Arrows
399
Christmas Trees
551
Collatz
679
CSS Colors
315
Divisors
546
Emojify
479
Fibonacci
726932
Fizz Buzz
577820481
Leap Years
399
Rock-paper-scissors-Spock-lizard
460
Roman to Arabic
389
Seven Segment
299
Tongue-twisters
356
United States
336
π
195