You mean, what does sequence A004431 [0] look like? Well, like itself. Some of its properties are also listed at that link. [0] https://oeis.org/A004431 https:

You mean, what does sequence A004431 [0] look like? Well, like itself. Some of its properties are also listed at that link. [0] https://oeis.org/A004431 https://oeis.org/A004431