Christmas Trees
761
Collatz
667
Emojify
952
Fizz Buzz
862
Jacobi Symbol
776
Kolakoski Sequence
583
Leap Years
639
Look and Say
706
Lucky Numbers
561
Lucky Tickets
812
Niven Numbers (Long)
743
Ordinal Numbers
796
Pernicious Numbers
534
Roman to Arabic
636
Spelling Numbers
660
United States
534
Vampire Numbers
327
π
421