Question

小学六年级找规律，急急急~~~

2 7 22 67
这组数有什么规律？
用X表示这列数中的任意一个数，用含X的式子表示出这列数的排列规律。

Answer 1

后一个数等于前一个数的3倍加1即（3n+1）

Answer 2

设X为这列数中明闷的第n个数，则X=2+5×3ⁿ‐²
这不像是小学的题呢
不知道你看不看得懂，跟厅槐配你说扮指一遍吧：X等于2加上5乘以3的（n减2）方
呃，好像越说越乱了。你自己去领悟吧。

Answer 3

楼上答得都是错的，不信自己代入第3个X看看
下一个数应该是202

Answer 4

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Answer 5

这里用Y表示X后面那个数，Y=3X+1。

Answer 6

2 2X3+1=7 7X3+1=22 22X3+1=67