Abundant Numbers
115th
Abundant Numbers (Long)
76th
Christmas Trees
117th
Collatz
122nd
Divisors
244th
Emirp Numbers
89th
Evil Numbers
124th
Evil Numbers (Long)
68th
Fibonacci
255th
Fizz Buzz
1,138th
Foo Fizz Buzz Bar
33rd
Fractions
77th
Happy Numbers
92nd
Happy Numbers (Long)
55th
Leap Years
155th
Look and Say
42nd
Niven Numbers
123rd
Niven Numbers (Long)
61st
Odious Numbers
197th
Ordinal Numbers
107th
Pascal’s Triangle
154th
Prime Numbers
231st
Recamán
100th