Abundant Numbers
576
664
Abundant Numbers (Long)
630
701
Arabic to Roman
367
Arithmetic Numbers
658
725
Billiards
621
Christmas Trees
625
Collatz
696
817
Cubes
368
Diamonds
408
Divisors
667
720
Evil Numbers
630
Evil Numbers (Long)
636
Fibonacci
726944873818
Fizz Buzz
541
633
Happy Numbers
443
Leap Years
740
833768
Niven Numbers
598
687
Niven Numbers (Long)
600
664
Number Spiral
387
Odious Numbers
562
642
Odious Numbers (Long)
664
Pascal’s Triangle
581
Prime Numbers
642
Prime Numbers (Long)
630
Roman to Arabic
282
Sierpiński Triangle
246
Smith Numbers
438
542
Tongue-twisters
389