12 Days of Christmas
862869
99 Bottles of Beer
684
Arabic to Roman
520497
Arrows
495456
Card Number Validation
520
Christmas Trees
431
CSS Colors
118
Diamonds
495472
Evil Numbers
450
Fizz Buzz
833875
Hexdump
753
ISBN
781
Morse Encoder
260
Niven Numbers
674712
Odious Numbers
663
Reverse Polish Notation
720
Roman to Arabic
509
Tongue-twisters
619