12 Days of Christmas
487
99 Bottles of Beer
457
Abundant Numbers
296
Christmas Trees
262
CSS Colors
134
Diamonds
208
Divisors
413
Emirp Numbers
Fibonacci
403
Fizz Buzz
437520407
Happy Numbers
219
Intersection
245
Leap Years
387
Morse Decoder
176
Morse Encoder
157
Niven Numbers
322
Prime Numbers
273
Seven Segment
173
Sierpiński Triangle
324
Tongue-twisters
540
United States
159