12 Days of Christmas
666
99 Bottles of Beer
656
Abundant Numbers
742
Abundant Numbers (Long)
833
Arithmetic Numbers
829
Arrows
398
Ascending Primes
261
ASCII Table
226
Christmas Trees
263
Collatz
864
CSS Colors
176
Cubes
156
Divisors
806
Emirp Numbers
556
Emojify
374
Evil Numbers
597
Evil Numbers (Long)
482
Fibonacci
655
Fizz Buzz
736
Foo Fizz Buzz Bar
725
Happy Numbers
558
ISBN
645
Leap Years
729
Leyland Numbers
785
Look and Say
104
Niven Numbers
721
Niven Numbers (Long)
806
Number Spiral
419
Odious Numbers
482
Odious Numbers (Long)
488
Prime Numbers
597
Sierpiński Triangle
380
Spelling Numbers
366
Tongue-twisters
587