12 Days of Christmas
80
Abundant Numbers
477
Arabic to Roman
361
Collatz
707
Divisors
771
Emirp Numbers
365
Evil Numbers
835
Evil Numbers (Long)
815
Fibonacci
935
Fizz Buzz
348
Foo Fizz Buzz Bar
516
Fractions
415
Happy Numbers
396
Happy Numbers (Long)
426
Leap Years
743743
Niven Numbers
719
Niven Numbers (Long)
786
Odious Numbers
799
Odious Numbers (Long)
781
Pascal’s Triangle
800
Pernicious Numbers
349
Prime Numbers
688
Recamán
543
Smith Numbers
538
Van Eck Sequence
474
π
56
τ
56
φ
1124750