29

Multi tool use
数表 — 整数
<<
20
21
22
23
24
25
26
27
28
29
>>
|
小写 |
二十九
|
大写 |
貳拾玖
|
质因数分解 |
质数
|
罗马数字 |
XXIX
|
二进制 |
11101
|
八进制 |
35
|
十二进制 |
25
|
十六进制 |
1D
|
29是28与30之间的自然数。
数学性质
- 第10個質數。前一個為23、下一個為31。
- 第5对孿生質數,為(29、 31)。
- 陳素數
- 第6個索菲熱爾曼素數:对应安全素数为 59
- 第3個強素數
質數階乘質數。
- 第6個危險質數。前一個是19、下一個是31。
- 此數字雖然是自然質數,但不是高斯質數。前一個有此性質的自然質數是17、下一個是37。(OEIS中的数列A002313)
- 其第一象限之高斯質數的整数分解為−i×(2+5i)×(5+2i){displaystyle -itimes left(2+5iright)times left(5+2iright)}
。
- 第23個虧數,真因數和為1,虧度為28。前一個為27、下一個為31。
- 第19個不尋常數,大於平方根的質因數為29。前一個為28、下一個為31。
- 第18個無平方數因數的數。前一個為26、下一個為30。
- 第5個佩爾數。前一個為12、下一個為70。
- 第8個盧卡斯數,前一個是18、下一個是47。
- 第18個十进制的等數位數。前一個為27、下一個為31。
- 它亦是三个连续正方形数的和(22+32+42)。
十二進制的水仙花數(OEIS中的数列A161949)
在其它领域中
闰年中2月的日数
铜的原子序数[1]
农历中小月的天数
農曆中年二十九晚是除夕(农历十二月是大月的年份则在三十)
農曆12個月當中,包含閏月最少都有29日。
参考文献
^ Royal Society of Chemistry - Visual Element Periodic Table
qj6WV6grjU8LwEMssnX1 yb XkE2OBu6hPyV,MAYdu8eeUF8o4mwt eYUr1A 88EwfS,zhP8MOoMzopy4e9TRJvpSdp4K 9LO4j
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