12 Days of Christmas
80
99 Bottles of Beer
21
346
Abundant Numbers
518
Arabic to Roman
308
Christmas Trees
536
Collatz
557
Cubes
341
Diamonds
453
Divisors
664
Emirp Numbers
446
Fibonacci
449
Fizz Buzz
461
Foo Fizz Buzz Bar
485
Fractions
336
Happy Numbers
300
Happy Numbers (Long)
375
Kolakoski Sequence
626
Leap Years
694
Leyland Numbers
534
Look and Say
509
Ordinal Numbers
412
Pascal’s Triangle
481
Recamán
587