- 2 - Wikipedia
2 (two) is a number, numeral and digit It is the natural number following 1 and preceding 3 It is the smallest and the only even prime number Because it forms the basis of a duality, it has religious and spiritual significance in many cultures
- 2（自然数之一）_百度百科
2：是一个自然数，同时也是1和3之间的正整数，也是偶数。如果一个数能被2整除，就是偶数，反之则是奇数。2是最小的质数（也叫素数），也是唯一的偶质数，只有1、2两个因数，是一个有理数。2也是黑格纳数。
- The Number 2 for kids - Learning to Count - Numbers from 1 to 10 - The . . .
Educational video for children to learn number 2 The little ones will learn how to trace number 2, how to pronounce it and also how to count with a series o
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- 2 - 维基百科，自由的百科全书
第2個 全哈沙德數，即在所有 进位制 中皆為 哈沙德數。 前一個為 1 、下一個為 4。 第2個 十进制 的 等數位數。 前一個為 1 、下一個為 3。 第1個 不可及數。 下一個為 5。 西爾維斯特數列 的第一項 佩蘭數列 的第三項和第五項 巴都萬數列 的第四項和第五項
- 2 -- from Wolfram MathWorld
The number two (2) is the second positive integer and the first prime number It is even, and is the only even prime (the primes other than 2 are called the odd primes) The number 2 is also equal to its factorial since A quantity taken to the power 2 is said to be squared The number of times a given binary number is divisible by 2 is given by the position of the first , counting from the
- 2 (number) - Simple English Wikipedia, the free encyclopedia
2 (Two; ˈtuː (listen)) is a number, numeral, and glyph It is the number after 1 (one) and the number before 3 (three) In Roman numerals, it is II
- 2 (number) - New World Encyclopedia
2 (two) is a number, numeral, and glyph that represents the number It is the natural number [1] that follows 1 and precedes 3 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
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