121 (عدد)
| ||||
---|---|---|---|---|
كمي | خطأ: الوظيفة "numeral_to_arabic" غير موجودة. | |||
ترتيبي | 121st (خطأ: الوظيفة "numeral_to_arabic" غير موجودة.) | |||
التحليل لعوامل | 112 | |||
القواسم | 1, 11, 121 | |||
العدد اليوناني | ΡΚΑ´ | |||
العدد الروماني | CXXI | |||
ثنائي | 11110012 | |||
ثلاثي | 111113 | |||
رباعي | 13214 | |||
خماسي | 4415 | |||
سداسي | 3216 | |||
ثماني | 1718 | |||
اثنا عشري | A112 | |||
ستة عشري | 7916 | |||
عشريني | 6120 | |||
أساس 36 | 3D36 |
121 (one hundred [and] twenty-one) is the natural number following 120 and preceding 122.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
في الرياضيات
One hundred [and] twenty-one is
- a square (11 times 11)
- the sum of the powers of 3 from 0 to 4, so a repunit in base 3. Furthermore 121 is the only square of the form , where p is prime (3, in this case).[بحاجة لمصدر]
- the sum of three consecutive primes (37 + 41 + 43).
- As 5! + 1 = 121 it is provides a solution to Brocard's problem. There are only two other squares known to be of the form n! + 1, . Another example of 121 being one of the few numbers supporting a conjecture is that Fermat conjectured that 4 and 121 are the only perfect squares of the form x3 - 4 (with x being 2 and 5, respectively).[1]
- It is also a star number and a centered octagonal number.
- In base 10, it is a Smith number since its digits add up to the same value as its factorization (which uses the same digits) and as a consequence of that it is a Friedman number (11^2). But it can not be expressed as the sum of any other number plus that number's digits, making 121 a self number.
في الحقول الأخرى
121 هو أيضاً:
- رقم طوارئ الكهرباء في مصر
- The number for voicemail for mobile phones on the Vodafone network[2]
- The undiscovered chemical element unbiunium has the atomic number 121
- The official end score for cribbage[3]
انظر أيضاً
- List of highways numbered 121
- United States House of Representatives House Resolution 121
- United Nations Security Council Resolution 121
المراجع
- ^ Wells, D., The Penguin Dictionary of Curious and Interesting Numbers, London: Penguin Group. (1987): 136
- ^ Vodafone, Calling and messaging
- ^ Rule 1.1 Archived 2015-01-18 at the Wayback Machine, American Cribbage Congress, retrieved 6 September 2011