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- 1 - Wikipedia
1 (one, unit, unity) is a number, numeral, and glyph It is the first and smallest positive integer of the infinite sequence of natural numbers
- 1（自然数之一）_百度百科
1，是一个阿拉伯数字。 1是一个自然数，是最小的正整数，是最小的正奇数。 1是一个有理数，是一位数，也是奇数。 1既不是质数也不是合数。 1的n次方（n∈R）都等于1。 1的倒数是它本身。 一个或者几个事物所组成的整体，可以看作是单位“1”。
- 1 - 维基词典，自由的多语言词典
(語音學，通常上標) 音調，根據當地的習慣，可以是高的，也可以是低的；‘1’是最常見的最高音或最低音（參見0） 近義詞： ˥ 、 ˩
- 1 (number) - New World Encyclopedia
The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line, as is still the case in Chinese script
- 1 (number) | Math Wiki | Fandom
1 is the only positive integer that is neither prime nor composite 1 is a divisor of any integer Not only that, but if you do , it will always equal 1 1 is the only odd practical number 1 can't be used as the base nor the argument of logarithms Community content is available under CC-BY-SA unless otherwise noted
- 1 (Number)
In scientific notation, it is written as 1 × 10 0 It has a total of 0 prime factors and 1 positive divisors There is one positive integer (up to 1) that is relatively prime to 1 The prime factorization of 1 is 1 Since it has a total of 0 prime factors, 1 is a composite number
- 1 -- from Wolfram MathWorld
Although the number 1 used to be considered a prime number, it requires special treatment in so many definitions and applications involving primes greater than or equal to 2 that it is usually placed into a class of its own (Wells 1986, p 31)
- Number 1 - Facts about the integer - Numbermatics
1 is an odd number which is uniquely neither prime nor composite It is known as the multiplicative identity or unit It’s also the only positive number with no other divisors See below for interesting mathematical facts about the number 1 from the Numbermatics database Cardinal: 1 can be written as One
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