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- 7（自然数之一）_百度百科
7，阿拉伯数字之一，是6与8之间的自然数。 在数学领域，它是第四个质数，也是奇数之一。 相当于汉语词语"七"或"柒"。 7在数论中是Heegner数。
- 7-Zip
7-Zip is a file archiver with a high compression ratio 7-Zip is free software with open source The most of the code is under the GNU LGPL license Some parts of the code are under the BSD 3-clause License Also there is unRAR license restriction for some parts of the code Read 7-Zip License information
- 7 - Wikipedia
7 (seven) is the natural number following 6 and preceding 8 It is the only prime number preceding a cube As an early prime number in the series of positive integers, the number seven has symbolic associations in religion, mythology, superstition and philosophy The seven classical planets resulted in seven being the number of days in a week
- 7 - 维基百科，自由的百科全书
7在佛教有圓滿之意，指包含東南西北四方、上下二方、當中，總共七個方位，亦即所有的空間，故有圓滿、一切、多數之意。
- 7 (number) - New World Encyclopedia
7 (seven) is a number, numeral, and glyph that represents the number It is the natural number [1] that follows 6 and precedes 8 It is an integer and a cardinal number, that is, a number that is used for counting [2] In addition, it is classified as a real number, [3] distinguishing it from imaginary numbers
- 7 —— 一个能让人跪拜的奇迹数字 - 知乎
在音乐中，“7”是物质世界的艺术之神，中国“宫商角徵羽”与西方“哆、来、咪、发、索、拉、稀”七个音符组成了一个奇妙的音乐世界。 用自然科学的眼光看，7个音及高八度，表达了物体振动波长的循环，艺术中7表达自然的韵节，7也是艺术的吉祥。
- 7这个数字有什么特殊意义吗？ - 知乎
“七”是过程、成长的数字，是宇宙潜藏的周期，我们常常会发现到七或七的倍数是成长过程及原则的依据。 “七”也是常被做爲一组的数字，一个星期七天，光谱中七个颜色等等．．． 由于宗教影响深远，文学作品中也出现了大量有关“七”的符号，这样又巩固了“七”的神秘性。 有关七的知识还有很多，供我们不断探索．．． 在0~9的十个数字中，7应该是个独特的数字。 国际上通用的历法中，一周的天数和七有关。 中国人对7也是情有独钟：“七仙女下凡”，“北斗七星”；成语中也有不少与7有关的：“七颠八倒”，“七零八落”，“七拼八凑”，“七窍生烟”，“七擒八纵”，“七上八下”，“七手八脚”，“七嘴八舌”；常说的“不管三七二十一”；祭奠亡灵时讲究“头七”、“二七”、┄┄“七七”。
- 7 (number) - Simple English Wikipedia, the free encyclopedia
In mathematics, the number seven is an odd number and a prime number It is also a Mersenne prime Take off the last digit and multiply it by 2 Subtract that product from the root number (the integer without the last digit) [1] Repeat the second step again and again until it is clear that the number is divisible by 7 or not Example 918785
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