SOLUTION: Does the number always have to be an even number each time to get a common difference in a arithmetic sequence?

Question 578597: Does the number always have to be an even number each time to get a common difference in a arithmetic sequence?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
There are many choices for an arithmetic sequence.
I can make one with all irrational numbers:

Maybe you are thinking of the formulas for the sum of an arithmetic sequence and about the 2 in the denominator. Well, the numerator will contain a product of two consecutive integers, like (n-1)n that will be even too, because one of those two integers has to be even. So, if the terms were integer, the sum will be integer too.
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