Abundant Numbers
554
629
Abundant Numbers (Long)
598
657
Arabic to Roman
343
Arithmetic Numbers
622
677
Billiards
542
Christmas Trees
581
Collatz
670
775
Cubes
338
Diamonds
379
Divisors
645
681
Evil Numbers
591
Evil Numbers (Long)
593
Fibonacci
706910838807
Fizz Buzz
530
614
Happy Numbers
412
Leap Years
716
788756
Niven Numbers
573
645
Niven Numbers (Long)
565
619
Number Spiral
352
Odious Numbers
536
599
Odious Numbers (Long)
615
Pascal’s Triangle
536
Prime Numbers
603
Prime Numbers (Long)
588
Roman to Arabic
257
Sierpiński Triangle
230
Smith Numbers
410
497
Tongue-twisters
372