Abundant Numbers
101st
Abundant Numbers (Long)
61st
Christmas Trees
106th
Collatz
93rd
Divisors
222nd
Emirp Numbers
81st
Evil Numbers
111th
Evil Numbers (Long)
55th
Fibonacci
224th
Fizz Buzz
1,048th
Foo Fizz Buzz Bar
30th
Fractions
66th
Happy Numbers
82nd
Happy Numbers (Long)
47th
Leap Years
136th
Look and Say
38th
Niven Numbers
100th
Niven Numbers (Long)
51st
Odious Numbers
177th
Ordinal Numbers
96th
Pascal’s Triangle
135th
Prime Numbers
206th
Recamán
87th