12 Days of Christmas
489455
99 Bottles of Beer
566
Arabic to Roman
487455
Arrows
562562
Card Number Validation
472
Christmas Trees
409
CSS Colors
138
Diamonds
463452
Evil Numbers
418
Fizz Buzz
753865
Hexdump
691
ISBN
731
Morse Encoder
216
Niven Numbers
617692
Odious Numbers
601
Reverse Polish Notation
636
Roman to Arabic
462
Tongue-twisters
559