SOLUTION: what is an arithmetic sequence?

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Question 388511: what is an arithmetic sequence?
Answer by Fombitz(32388) About Me  (Show Source):
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A sequence of numbers with a starting value where one number differs from the previous number by a fixed value.
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Example: 3,5,7,9,11,...: Starting value is 3, difference is 2 or algebraically,
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a%5Bn%5D+=+3%2B%28n-1%29%2A2
a%5Bn%5D=3%2B2n-2
a%5Bn%5D=2n%2B1, where n=1,2,3,...