12 Days of Christmas
80
Abundant Numbers
477
Arabic to Roman
362
Collatz
708
Divisors
771
Emirp Numbers
365
Evil Numbers
836
Evil Numbers (Long)
817
Fibonacci
935
Fizz Buzz
348
Foo Fizz Buzz Bar
516
Fractions
416
Happy Numbers
396
Happy Numbers (Long)
427
Leap Years
726743
Niven Numbers
720
Niven Numbers (Long)
787
Odious Numbers
800
Odious Numbers (Long)
783
Pascal’s Triangle
800
Pernicious Numbers
349
Prime Numbers
689
Recamán
544
Smith Numbers
539
Van Eck Sequence
475
π
56
τ
56
φ
744750