Abundant Numbers
616
716
Abundant Numbers (Long)
640
701
Arabic to Roman
367
Arithmetic Numbers
667
725
Billiards
621
Christmas Trees
625
Collatz
707
817
Cubes
379
Diamonds
408
Divisors
667
720
Evil Numbers
648
Evil Numbers (Long)
636
Fibonacci
742944873818
Fizz Buzz
541
633
Happy Numbers
557
Leap Years
740
833768
Niven Numbers
598
687
Niven Numbers (Long)
600
672
Number Spiral
387
Odious Numbers
562
651
Odious Numbers (Long)
664
Pascal’s Triangle
581
Prime Numbers
670
Prime Numbers (Long)
630
Roman to Arabic
287
Sierpiński Triangle
251
Smith Numbers
443
542
Tongue-twisters
538