# Is it ok to ask a more specific version of a question that I have asked?

I have asked this question yesterday: On the sum of digits of $n^k$ and it doesn't seem likely to receive a definitive answer anytime soon.

As TonyK pointed out in his answer the (seemingly simpler) problem of whether $\lim\limits_{n\to\infty}S(2^n)=\infty$ (which is actually a prerequisite for my question) is also not likely to have been proved, is it ok to open a new question on this problem (possibly a reference request to find works on this problem and related ones) or would that be too similar and counted as a duplicate?

Normally I would just edit the question, but it was already reduced from a search for a generic $n^k$ to the specific case of $n=2$

• I for one would not object to such a derived question, more so since TonyK's post is not really providing an answer but definitely a valuable contribution to the site. – Lord_Farin Jan 15 '15 at 20:13
• It won't be necessary in this case, since a user provided a link answering to the specific $n=2$ case (it had already been asked before, but somehow I missed it when searching for duplicates before asking), but if I ever find myself in the same situation I'll go ahead and ask the second question! – Alessandro Codenotti Jan 15 '15 at 20:45