99 Bottles of Beer
573
Abundant Numbers
627
Collatz
421
CSS Colors
177
Divisors
647
Emirp Numbers
602
Evil Numbers
321
Fibonacci
291
Fizz Buzz
540
344
439
Happy Numbers
160
Happy Numbers (Long)
163
Leap Years
569
Niven Numbers
354
Odious Numbers
350
Pernicious Numbers
302
Prime Numbers
705
Quine
893
π
304