Question 982069
This problem keeps being posted with the same exact wording.
No one will ever solve it because the wording has a typo that makes it meaningless.
The phrase "the number of the sequence" has no meaning at all.
If the wording was "the fifth number of the sequence" (or something like that),
and it was stated that it was an arithmetic sequence (or a geometric sequence),
then the problem would have meaning.
If the problem has no other words except what you posted,
there is nothing anyone can do about it.