12 Days of Christmas
173
99 Bottles of Beer
22
606
Abundant Numbers
540
Arabic to Roman
432
Christmas Trees
616
Collatz
666
Cubes
464
Diamonds
543
Divisors
701
Emirp Numbers
551
Fibonacci
450
Fizz Buzz
505
Foo Fizz Buzz Bar
611
Fractions
395
Happy Numbers
387
Happy Numbers (Long)
442
Kolakoski Sequence
627
Leap Years
695
Leyland Numbers
628
Look and Say
626
Ordinal Numbers
506
Pascal’s Triangle
483
Recamán
591