Christmas Trees
2nd
Collatz
5th
Emojify
2nd
Fizz Buzz
2nd
Jacobi Symbol
2nd
Kolakoski Sequence
6th
Leap Years
4th
Look and Say
2nd
Lucky Numbers
3rd
Lucky Tickets
2nd
Niven Numbers (Long)
5th
Ordinal Numbers
3rd
Pernicious Numbers
10th
Roman to Arabic
4th
Spelling Numbers
3rd
United States
2nd
Vampire Numbers
3rd
π
3rd