Re: [math-fun] n and n^3 have all digits odd

James Buddenhagen:

Is this known to be a finite sequence?

I think the best we can ever really do with this sort of problem is conjecture it to be true and provide a large number up to which it is known to be true. There was another such question brought up recently on SeqFan asking if 34155 is the only odd number equal to the sum of its proper divisors greater than (or equal to) its square root.