12 Days of Christmas
80
Abundant Numbers
477
Arabic to Roman
361
Collatz
707
Divisors
771
Emirp Numbers
365
Evil Numbers
836
Evil Numbers (Long)
816
Fibonacci
935
Fizz Buzz
348
Foo Fizz Buzz Bar
516
Fractions
415
Happy Numbers
396
Happy Numbers (Long)
426
Leap Years
743743
Niven Numbers
720
Niven Numbers (Long)
786
Odious Numbers
800
Odious Numbers (Long)
782
Pascal’s Triangle
800
Pernicious Numbers
349
Prime Numbers
688
Recamán
543
Smith Numbers
539
Van Eck Sequence
474
π
56
τ
56
φ
1124750