Christmas Trees
763
Collatz
670
Emojify
952
Fizz Buzz
852
Jacobi Symbol
760
Kolakoski Sequence
584
Leap Years
641
Look and Say
706
Lucky Numbers
562
Lucky Tickets
816
Niven Numbers (Long)
745
Ordinal Numbers
800
Pernicious Numbers
536
Roman to Arabic
639
Spelling Numbers
660
United States
535
Vampire Numbers
327
π
423