12 Days of Christmas
173
Abundant Numbers
497
Arabic to Roman
506
Collatz
843
Divisors
813
Emirp Numbers
450
Evil Numbers
835
Evil Numbers (Long)
815
Fibonacci
934
Fizz Buzz
382
Foo Fizz Buzz Bar
650
Fractions
488
Happy Numbers
510
Happy Numbers (Long)
502
Leap Years
744743
Niven Numbers
721
Niven Numbers (Long)
788
Odious Numbers
799
Odious Numbers (Long)
781
Pascal’s Triangle
863
Pernicious Numbers
349
Prime Numbers
688
Recamán
602
Smith Numbers
731
Van Eck Sequence
500
π
63
τ
62
φ
1134751