Question 1196746
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What is the sequence you are talking about in this problem ?


Without your precise description of the sequence, it is impossible to answer your questions.



My impression is that two different problems are mistakenly mixed in your post.


In any case, there is no logical connection between different parts of the post.



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Please do not post your explanations to me in person.


Simply, in next time, keep in mind that your post should be self-explanatory 
and its meaning should be clear to anyone without additional explanations, 
without additional questions and without guessing.



Otherwise, it can not be considered as a Math problem.