12 Days of Christmas
80
99 Bottles of Beer
22
346
Abundant Numbers
518
Arabic to Roman
309
Christmas Trees
537
Collatz
559
Cubes
328
Diamonds
454
Divisors
665
Emirp Numbers
447
Fibonacci
450
Fizz Buzz
461
Foo Fizz Buzz Bar
485
Fractions
337
Happy Numbers
300
Happy Numbers (Long)
376
Kolakoski Sequence
616
Leap Years
695
Leyland Numbers
535
Look and Say
510
Ordinal Numbers
406
Pascal’s Triangle
484
Recamán
591