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This is a question spoj question. http://www.spoj.com/problems/WTK/ Instead of a fixed jump(ex: 2), if I have it incrementing , 2,3,4,5.. then how can I calculate the required recursive formula?

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Welcome to math.SE: since you are new, I wanted to let you know a few things about the site. In order to get the best possible answers, it is helpful if you say in what context you encountered the problem, and what your thoughts on it are; this will prevent people from telling you things you already know, and help them give their answers at the right level. If this is homework, please add the homework tag; people will still help, so don't worry. Please consider rewriting your post – Dennis Gulko Dec 16 '12 at 8:55

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