n means any number in the sequence.
Let's take for example the sequence; x=0,2,4,6,8,10,12,14
when x=4, then n=3, because 4 is the third number in the sequence
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A single number, such as 491625 does not define a sequence and so cannot have an nth term.
The question does not contain a sequence but a single large number whose digits are the digits of the sequence, 3n run together. There is only one number, not a sequence, so there is no nth term.
A single number, such as 44444, does not define a sequence.
One number, such as 7101316 does not define a sequence.
241688