12 Days of Christmas
487
99 Bottles of Beer
461
Abundant Numbers
298
Christmas Trees
261
CSS Colors
134
Diamonds
209
Divisors
398
Emirp Numbers
Fibonacci
396
Fizz Buzz
421366407
Happy Numbers
215
Intersection
247
Leap Years
389
Morse Decoder
174
Morse Encoder
157
Niven Numbers
317
Prime Numbers
267
Seven Segment
173
Sierpiński Triangle
320
Tongue-twisters
540
United States
159