12 Days of Christmas
80
99 Bottles of Beer
21
346
Abundant Numbers
518
Arabic to Roman
308
Christmas Trees
536
Collatz
559
Cubes
341
Diamonds
454
Divisors
665
Emirp Numbers
447
Fibonacci
450
Fizz Buzz
461
Foo Fizz Buzz Bar
485
Fractions
336
Happy Numbers
300
Happy Numbers (Long)
375
Kolakoski Sequence
616
Leap Years
694
Leyland Numbers
535
Look and Say
509
Ordinal Numbers
412
Pascal’s Triangle
483
Recamán
589