I need to solve a low high school home work and I ask a question about the most correct notation. The problem is to build a set of circles with $r$ and $d$ such that $d=5, 15, 25, 35,...d_{+_1}$ and so on. All values of $d$ should be ended by $5.$ What is the best notation for that and how to formulated as $d(mod)5.$ Sorry for the weak question and thank you for your help. My brother wrote the question for me.
2026-04-07 22:49:01.1775602141
What notation to use for a sequence of integers that end with digit 5?
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Using a subscript notation, you can say the values of $d$ come from the series $d_1, d_2, d_3, \ldots$, where $d_n = 10n - 5$.