12 Days of Christmas
489455
99 Bottles of Beer
566
Arabic to Roman
487455
Arrows
562563
Card Number Validation
473
Christmas Trees
409
CSS Colors
138
Diamonds
463452
Evil Numbers
419
Fizz Buzz
753865
Hexdump
672
ISBN
731
Morse Encoder
197
Niven Numbers
618692
Odious Numbers
602
Reverse Polish Notation
637
Roman to Arabic
462
Tongue-twisters
559