Abundant Numbers
827
Arithmetic Numbers
683
Catalan Numbers
637
Collatz
913300737
Divisors
709
Evil Numbers
608
Fibonacci
576
Fizz Buzz
635
Foo Fizz Buzz Bar
654
Happy Numbers
469
Intersection
656
Kaprekar Numbers
666
Leap Years
848
Niven Numbers
643
Niven Numbers (Long)
270
Odious Numbers
626
Recamán
451