Does this part of an arithmetic progression have a name?

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In this arithmetic progression - 11+30w, 11 is the initial term, 30 is the common difference, and w is what? I use the letter w because it is the first letter of the word whole, and I use w to represent the whole numbers. So, 30·0=0. 11+0=11. When w=0, the polynomial equals 11. Did I say that right? I want to say that when the what is 0, the polynomial is 11, however, what is not the right word. Also, I want to be able to describe the polynomial if I were to make a change to the w. I have a mathematical concept, but I need a word to use to explain it.