Collatz
Divisors
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Leap Years
3,727th3,601st2,753rd2,444th2,631st3,606th2,522nd3,629th3,576th3,742nd2,389th1,890th2,482nd3,472nd3,297th3,263rd3,231st2,695th3,761st2,900th3,633rd2,206th2,949th2,891st3,704th