Abundant Numbers
669
Abundant Numbers (Long)
670
Arrows
577
Collatz
916
Divisors
626
Emirp Numbers
540
Emirp Numbers (Long)
494
Evil Numbers
741
Evil Numbers (Long)
769
Factorial Factorisation
76
Fizz Buzz
496
Foo Fizz Buzz Bar
448
Happy Numbers
673
Happy Numbers (Long)
105
Leap Years
57
Niven Numbers
720
Odious Numbers
754
Odious Numbers (Long)
767
Pernicious Numbers
752
Prime Numbers
677
Prime Numbers (Long)
669
Quine
891
Sierpiński Triangle
131
Tongue-twisters
514