Christmas Trees
3rd
Evil Numbers
43rd
Fibonacci
42nd
Happy Numbers
27th
Happy Numbers (Long)
27th
Intersection
12th
ISBN
25th
Levenshtein Distance
8th
Look and Say
20th
Lucky Tickets
13th
Niven Numbers
28th
Number Spiral
14th
Odious Numbers
45th
Pernicious Numbers
33rd
Prime Numbers
44th
Prime Numbers (Long)
44th
Rule 110
13th
Tongue-twisters
Van Eck Sequence
20th