首先,你的这个命题是错误的,至少说是不全面的。虽然组成幻方的数都有规律可循,但不仅仅只有等差数列能组成幻方。示例如下:
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/08f790529822720ee67c9b3572cb0a46f31fab4b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
三阶幻方:三个数一组的三组数,数组间等差,数组中数与数等差,就能组成三阶幻方。如上图所示,这九个数并不是等差数列,而是三个等差的数组。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/728da9773912b31b022bb6e68f18367adbb4e1be?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
四阶幻方:四个数一组的四组数,只要数组中对应位置的差值相等即可构成四阶幻方。这16个数既非等差数列,也非等差数组。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/500fd9f9d72a6059d30485d52134349b023bbaed?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
只不过在一定条件下能组成四阶完美幻方。如上图所示。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/d439b6003af33a87eb7d67d5cf5c10385243b5e8?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
五阶幻方:五个数一组的五组数,只要数组中对应位置的差值相等即可用跳马法构成五阶完美幻方。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/08f790529822720ee83e853572cb0a46f31fab09?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
以中心数对称等差的25个数,用镶边法可组成五阶幻方。