12 Days of Christmas
399
Abundant Numbers
686
Abundant Numbers (Long)
718
Arabic to Roman
471
Arithmetic Numbers
659
Arrows
685
Ascending Primes
380
Christmas Trees
365
Collatz
761
Divisors
605
Evil Numbers
463
Evil Numbers (Long)
476
Fibonacci
371
Leap Years
460
Rock-paper-scissors-Spock-lizard
494