12 Days of Christmas
502461
99 Bottles of Beer
586
Arabic to Roman
520471
Arrows
601586
Card Number Validation
520
Christmas Trees
431
CSS Colors
149
Diamonds
495472
Evil Numbers
442
Fizz Buzz
771875
Hexdump
731
ISBN
781
Morse Encoder
228
Niven Numbers
652712
Odious Numbers
639
Reverse Polish Notation
720
Roman to Arabic
497
Tongue-twisters
572