I spread the notebook on the table and waved to Yuri. She dragged a chair and sat gently on my left.
A scent of shampoo floated in the air. Yuri took a pair of resin-framed glasses from her chest pocket
and put them on.
“Eh? Is this written by your brother?”
Yuri leaned over and looked at the notebook in surprise. It was written by Mirka.
“Uh, this is written by my brother’s friend.”
“Huh, the handwriting is so beautiful, just like a girl’s.”
It was written by a girl in the first place. I thought to myself.
我把笔记本在桌子上摊开，冲尤里招手。她拖着椅子轻轻坐在我左边。
瞬间飘来一股洗发水的香气。尤里从胸前口袋中取出一副树脂边框的眼镜戴上。
“咦？这是哥哥写的？”
尤里探着头，惊讶地看着笔记本。是米尔嘉的笔迹。
“呃，这是哥哥的朋友写的。”
“诶，字好漂亮，简直跟女生写的一样。”
本来就是女生写的嘛。我心想。
“It’s simple, isn’t it? 450, right?”
“Yes, correct. The difference is 450. Why?”
“Only 450 does not end with the number 1, the other five numbers all end with 1.”
“That’s right…… Can you answer the next question? This is also a question from my friend.”
“很简单啊，450对吧？”
“嗯，正确。不同的是450。为什么呢？”
“只有450不是以数字1结尾，其他五个数字都是以1结尾的。”
“没错……那么，你能答对下一道题吗？这也是我朋友出的题。”
「簡単でしょう？450ですね？」
「はい、正解です。違うのは450です。なぜですか？」
「450だけが1で終わっていない、他の5つの数字はすべて1で終わっている」
「そうですね……次の問題に答えられますか？これも友達の出題です」
“Eh? All of them end with 1.”
“Yes, this question is different from the previous one. The difference between the numbers in each question is different.”
“I don’t know. Do you know, brother?”
“诶？全部都以 1 结尾啊。”
“嗯，这一题跟上一题的规则不一样，每道题数字间的不同之处都是不一样的。”
“我不知道。哥哥你知道吗？”
“Well, it’s obvious, 51 is different.”
“Eh? Why?”
“Only 51 is not a prime number. Because 51 = 3 x 17 can be decomposed into prime factors, so 51 is a composite number, while the others are prime numbers.”
“How could I know that!”
“Then let’s see the next question.”
“嗯，很明显啊，51是不同的。”
“诶？为什么？”
“只有51不是质数。因为51=3 x 17可以分解质因数，所以51是合数，而其他都是质数。”
“这我怎么可能知道嘛！”
“那看看下道题如何？”
“Hmm…… 256, right? Other numbers all have two consecutive identical numbers. 100 has 00, 225 has 22, 288 has 88…… right?”
“But 121 is not consecutive?”
“Hmm…… there are two 1s, so it counts.”
“Then how about 361?”
“Hmm……”
“嗯……哥哥，是 256 吧？其他数字中都有两个连续相同的数。100 的 00，225 的 22，288 的 88……对吧？”
“但是 121 不连续啊？”
“唔……有两个 1 相同，所以也算是啦。”
“那 361 又怎么算呢？”
“唔……”
“In this question, the difference is 288.”
“Why why?”
“Only 288 is not a square number. That is to say, only 288 cannot be transformed into the form of a square of an integer.”
“这道题里，不同的是 288。”
“为什么为什么？”
“只有 288 不是平方数。也就是说，只有 288 不能变成某个整数的平方的形式。”
“I can know this, it’s too strange.”
“Then how about the next question? I spent a whole day to solve this question.”
“我说哥哥，我能知道这个才怪呢。”
“那下面这道题如何？哥哥我可是花了一整天才解开这道题的。”
“Can you think all day? It’s too scary.” Yuri said.
At this time, my mother brought cocoa.
To be continued……
“你能想一整天？太吓人了。”尤里说。
这时，我妈拿来了可可。
未完待续……
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