12 Days of Christmas
174
Abundant Numbers
505
Arabic to Roman
521
Collatz
861
Divisors
826
Emirp Numbers
459
Evil Numbers
851
Evil Numbers (Long)
837
Fibonacci
947
Fizz Buzz
384
Foo Fizz Buzz Bar
659
Fractions
503
Happy Numbers
521
Happy Numbers (Long)
518
Leap Years
759
754
Niven Numbers
733
Niven Numbers (Long)
806
Odious Numbers
816
Odious Numbers (Long)
804
Pascal’s Triangle
885
Pernicious Numbers
357
Prime Numbers
702
Recamán
616
Smith Numbers
759
Van Eck Sequence
519
π
64
τ
64
φ
124
49
52