Abundant Numbers
619
612
605
769
660
Arrows
427
Collatz
693
747
CSS Colors
188
Emirp Numbers
366
Evil Numbers
785
Fibonacci
934
Fizz Buzz
753
674
976
536
Foo Fizz Buzz Bar
749
986
Fractions
728
Happy Numbers
497
Happy Numbers (Long)
495
ISBN
561
Niven Numbers
549
773
Odious Numbers
783
Ordinal Numbers
717
Pangram Grep
814
Pernicious Numbers
362
Prime Numbers
456
Prime Numbers (Long)
342
Quine
684
673
946
RecamΓ‘n
465
Smith Numbers
535
Tongue-twisters
586
750
United States
187
β2
677
π
670