99 Bottles of Beer
552
Abundant Numbers
606
Collatz
380
CSS Colors
153
Divisors
625
Emirp Numbers
577
Evil Numbers
310
Fibonacci
283
Fizz Buzz
521
338
433
Happy Numbers
154
Happy Numbers (Long)
156
Leap Years
554
Niven Numbers
344
Odious Numbers
337
Pernicious Numbers
291
Prime Numbers
676
Quine
857
π
295