查找系列的第 n 项 [英] Finding the nth term of a series

问题描述

找出 DJ(i) 的第 n 项.

Find the n'th term of DJ(i).

给定 DJ(i) 是 i 在 DJ(i) 中出现的次数

Given DJ(i) is the number of times i is present in DJ(i)

数组DJ(i)如图所示:

The array DJ(i) is as shown:

   i       1 2 3 4 5 6 7 8 9 10 ..... 
DJ(i)      1 2 2 3 3 4 4 4 5  5 .....

我想要系列 DJ(i) 的第 n 个学期.我必须对这个词进行一些进一步的计算.

I want the nth term of the series DJ(i). I have to carry out some further calculations with the term.

推荐答案

在这个表中查找值 或用您选择的编程语言自己计算表格(留作简单练习).还要检查这个 SO answer 和 OEIS.

Look up the value in this table or compute yourself the table in the programming language of your choice (left as an easy exercise). Also check this SO answer and OEIS.

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