Abundant Numbers
115th
Abundant Numbers (Long)
76th
Christmas Trees
118th
Collatz
121st
Divisors
244th
Emirp Numbers
98th
Evil Numbers
124th
Evil Numbers (Long)
67th
Fibonacci
255th
Fizz Buzz
1,137th
Foo Fizz Buzz Bar
34th
Fractions
77th
Happy Numbers
96th
Happy Numbers (Long)
53rd
Leap Years
155th
Look and Say
41st
Niven Numbers
123rd
Niven Numbers (Long)
61st
Odious Numbers
196th
Ordinal Numbers
106th
Pascal’s Triangle
154th
Prime Numbers
229th
Recamán
99th