Christmas Trees
761
Collatz
666
Emojify
952
Fizz Buzz
862
Jacobi Symbol
784
Kolakoski Sequence
618
Leap Years
638
Look and Say
705
Lucky Numbers
560
Lucky Tickets
812
Niven Numbers (Long)
742
Ordinal Numbers
796
Pernicious Numbers
533
Roman to Arabic
636
Spelling Numbers
660
United States
534
Vampire Numbers
326
π
421