Assuming that "n" is a positive integer, it means that you multiply the number 5 repeatedly with itself - the number 5, in this case, appears a total of "n" times as a factor. For example, if n = 4, 5n = 54 = 5 x 5 x 5 x 5. That is, the number 5 appears 4 times as a factor.
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To the power of n, or to the nth power means that a number is multiplied by itself n times. i.e. 53 = 5 to the power of 3, means 5x5x5 = 125.
1254
The nth term is: 5-2n
If you mean -1 3 7 11 15 then the nth term is 4n-5 and so the next term will be 19
If you mean: 6 12 18 24 then the nth term is 6n