12 Days of Christmas
5th
99 Bottles of Beer
9th
Abundant Numbers
7th
Abundant Numbers (Long)
102nd7th
Arabic to Roman
20th
Christmas Trees
6th
Collatz
6th
Day of Week
1st
Divisors
1st
Evil Numbers
1st9th
Evil Numbers (Long)
32nd6th
Fibonacci
154th7th
Fizz Buzz
182nd3rd
Foo Fizz Buzz Bar
110th8th
Forsyth–Edwards Notation
3rd
Happy Numbers (Long)
7th
Inventory Sequence
4th
Jacobi Symbol
3rd
Leap Years
7th
Levenshtein Distance
8th
Leyland Numbers
4th
Look and Say
5th
Lucky Numbers
3rd
Niven Numbers
12th
Niven Numbers (Long)
7th
Number Spiral
3rd
Odious Numbers
1st9th
Odious Numbers (Long)
1st7th
Pascal’s Triangle
1st
Pernicious Numbers
1st7th
Prime Numbers
1st
Prime Numbers (Long)
41st1st
Quine
56th
Recamán
5th
Roman to Arabic
17th
SI Units
2nd
United States
1st
Van Eck Sequence
4th