Skip to content

577:142857为什么会“转圈”?

October 23, 2026 · 48 min

Show notes

142857乘以2、3、4、5、6,为什么数字只是换了位置,绕成一圈的顺序却始终没乱?一乘以7,怎么又突然变成了六个9?这场数字戏法,和七分之一算不完的小数有什么关系?同样是六位一循环,换成十三分之一,为什么就玩不转了?如果换一套计数规则,最后出来“包场”的9,怎么还能变成6?把七颗骰子的点数重新排列,凑出7的倍数,竟然比凑出偶数还容易?小学竖式除法里的余数,又怎样把这些问题串起来,一路通向数学家研究了近百年的难题?这期,旭岽从计算器上的六个数字出发,拆开“走马灯数”背后的数学机关!


文案:神经(小黑)

主播:旭岽

后期:Astra​

All episodes of 原来是这样 Dscience

Settings

Display

Language

Decides which stations you see first on the home page.

History

Recently played stations and episodes and your latest searches are only stored in this browser.

Notifications

A short notice when a podcast you follow has a new episode. Turn off single podcasts with the bell on their page.

Account

Save favorites – in the app and on the website.

Keyboard shortcuts

/
Open search
Space
Play or pause
← →
In the player: back 15 s, forward 30 s (episodes) · in a row: next tile
↑ ↓
In a row: target within the tile
Home / End
In a row: first or last tile
Esc
Close window or menu
?
This overview
Now playing

Go to station page

Play next

    Add episodes with “Play next” – they play after the current episode.