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Is this sequence arithmetic?

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An arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant. For instance, the sequence 5, 7, 9, 11, 13, 15 … is an arithmetic sequence with common difference of 2.
 
-Wikipedia
 
In Wikipedia's example, 
         5           1st term
5+2 = 7          2nd term
7+2 = 9       3rd term
...
(  )+2= (  )   nth term
...
 
Formula for the n-th term,
an=a1+(n-1)(d)
an is the n-th term
a1 is the first term
d is the difference
 
So in wikipedia's example,
an=a1+(n-1)(d)
an = 5+(n-1)*2
 
Use your own numbers, and try to put the right parts into the formula.