250 (number)
Encyclopedia
250 is the natural number
following 249 and preceding 251
.
As a Mandarin slang
term, 250 (二百五 pinyin
èrbǎiwǔ) is an insult meaning "stupid person" or "simpleton". The expression is based on bàndiàozi (半弔子 or 半吊子). In ancient China, copper coins were grouped by stringing them together through the square holes in the center; originally 1000 was a unit of currency called a diao. Ban diao zi literally means half a diao (500 coins), which is a slang term referring to a person who is inadequate in skills or mental abilities. Since modest Chinese scholars may call themselves ban diao zi to humbly deprecate their own expertise, ban diao zi is not necessarily a pejorative term. On the other hand, Er bai wu (250) is half of a ban diao zi and it is an insult.
Two hundred [and] fifty is also:
is prime, Sophie Germain prime
, sum of three consecutive primes (79 + 83 + 89), sum of seven consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47), Chen prime
, Eisenstein prime
with no imaginary part.
----
Two hundred [and] fifty-two = 22·32·7, refactorable number
, Harshad number
, central binomial coefficient
(10, 5), the largest one divisible by all coefficients in the previous line, member of the Mian–Chowla sequence
----
Two hundred [and] fifty-three 253 = 11·23, triangular number
, star number
, centered heptagonal number
, centered nonagonal number
, Blum integer
----
Two hundred [and] fifty-four 254 = 2·127, Mertens function returns 0, nontotient
----
Two hundred [and] fifty-five
has its own article.
----
Two hundred [and] fifty-six
has its own article.
----
Two hundred [and] fifty-seven 257 prime, Fermat prime, balanced prime, Chen prime, Eisenstein prime with no imaginary part
----
Two hundred [and] fifty-eight 258 = 2·3·43, sphenic number
, sum of four consecutive primes (59 + 61 + 67 + 71), nontotient
----
Two hundred [and] fifty-nine 259 = 7·37, repdigit
in base 6 (1111).
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...
following 249 and preceding 251
251 (number)
251 is the natural number between 250 and 252. It is also a prime number.-In mathematics:251 is a regular prime, an Eisenstein prime, a Chen prime, a Gaussian prime, a Sophie Germain prime, and a sexy prime....
.
| Cardinal Cardinal number In mathematics, cardinal numbers, or cardinals for short, are a generalization of the natural numbers used to measure the cardinality of sets. The cardinality of a finite set is a natural number – the number of elements in the set. The transfinite cardinal numbers describe the sizes of infinite... |
Two hundred [and] fifty |
| Ordinal Ordinal number In set theory, an ordinal number, or just ordinal, is the order type of a well-ordered set. They are usually identified with hereditarily transitive sets. Ordinals are an extension of the natural numbers different from integers and from cardinals... |
250th |
| Factorization Factorization In mathematics, factorization or factoring is the decomposition of an object into a product of other objects, or factors, which when multiplied together give the original... |  |
| Roman numeral | CCL |
| Binary Binary numeral system The binary numeral system, or base-2 number system, represents numeric values using two symbols, 0 and 1. More specifically, the usual base-2 system is a positional notation with a radix of 2... |
11111010 |
| Hexadecimal Hexadecimal In mathematics and computer science, hexadecimal is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F to represent values ten to fifteen... |
FA |
| Hebrew Hebrew language Hebrew is a Semitic language of the Afroasiatic language family. Culturally, is it considered by Jews and other religious groups as the language of the Jewish people, though other Jewish languages had originated among diaspora Jews, and the Hebrew language is also used by non-Jewish groups, such... | |
As a Mandarin slang
Slang
Slang is the use of informal words and expressions that are not considered standard in the speaker's language or dialect but are considered more acceptable when used socially. Slang is often to be found in areas of the lexicon that refer to things considered taboo...
term, 250 (二百五 pinyin
Pinyin
Pinyin is the official system to transcribe Chinese characters into the Roman alphabet in China, Malaysia, Singapore and Taiwan. It is also often used to teach Mandarin Chinese and spell Chinese names in foreign publications and used as an input method to enter Chinese characters into...
èrbǎiwǔ) is an insult meaning "stupid person" or "simpleton". The expression is based on bàndiàozi (半弔子 or 半吊子). In ancient China, copper coins were grouped by stringing them together through the square holes in the center; originally 1000 was a unit of currency called a diao. Ban diao zi literally means half a diao (500 coins), which is a slang term referring to a person who is inadequate in skills or mental abilities. Since modest Chinese scholars may call themselves ban diao zi to humbly deprecate their own expertise, ban diao zi is not necessarily a pejorative term. On the other hand, Er bai wu (250) is half of a ban diao zi and it is an insult.
Two hundred [and] fifty is also:
- SMTP status code for mail action completed.
- In the Holy Bible, the number of men rebelling against Moses, who were swallowed up by a fire. (Numbers 26:10).
- The number of PokémonPokémonis a media franchise published and owned by the video game company Nintendo and created by Satoshi Tajiri in 1996. Originally released as a pair of interlinkable Game Boy role-playing video games developed by Game Freak, Pokémon has since become the second most successful and lucrative video...
originally available in Pokémon Gold and SilverPokémon Gold and Silverare the second installments of the Pokémon series of role-playing video games developed by Game Freak and published by Nintendo for the Game Boy Color. The games have dual-mode capabilities allowing them to also be played on earlier Game Boy models. They were first released in Japan in 1999 and to...
before CelebiCelebi (Pokémon)is a Pokémon species in Nintendo and Game Freak's Pokémon franchise. Created by Ken Sugimori, they first appeared in the video games Pokémon Gold and Silver and subsequent sequels. They have later appeared in various merchandise, spinoff titles and animated and printed adaptations of the franchise...
was added.
251 - 259
Two hundred [and] fifty-one251 (number)
251 is the natural number between 250 and 252. It is also a prime number.-In mathematics:251 is a regular prime, an Eisenstein prime, a Chen prime, a Gaussian prime, a Sophie Germain prime, and a sexy prime....
is prime, Sophie Germain prime
Sophie Germain prime
In number theory, a prime number p is a Sophie Germain prime if 2p + 1 is also prime. For example, 23 is a Sophie Germain prime because it is a prime and 2 × 23 + 1 = 47, and 47 is also a prime number...
, sum of three consecutive primes (79 + 83 + 89), sum of seven consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47), Chen prime
Chen prime
A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes. The even number 2p + 2 therefore satisfies Chen's theorem....
, Eisenstein prime
Eisenstein prime
In mathematics, an Eisenstein prime is an Eisenstein integerz = a + b\,\omega\qquadthat is irreducible in the ring-theoretic sense: its only Eisenstein divisors are the units , a + bω itself and its associates.The associates and the complex conjugate...
with no imaginary part.
----
Two hundred [and] fifty-two = 22·32·7, refactorable number
Refactorable number
A refactorable number or tau number is an integer n that is divisible by the count of its divisors, or to put it algebraically, n is such that \tau|n. The first few refactorable numbers are listed in 1, 2, 8, 9, 12, 18, 24, 36, 40, 56, 60, 72, 80, 84, 88, 96...
, Harshad number
Harshad number
A Harshad number, or Niven number in a given number base, is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers were defined by D. R. Kaprekar, a mathematician from India. The word "Harshad" comes from the Sanskrit + , meaning joy-giver. The Niven...
, central binomial coefficient
Central binomial coefficient
In mathematics the nth central binomial coefficient is defined in terms of the binomial coefficient byThey are called central since they show up exactly in the middle of the even-numbered rows in Pascal's triangle...
(10, 5), the largest one divisible by all coefficients in the previous line, member of the Mian–Chowla sequence
----
Two hundred [and] fifty-three 253 = 11·23, triangular number
Triangular number
A triangular number or triangle number numbers the objects that can form an equilateral triangle, as in the diagram on the right. The nth triangle number is the number of dots in a triangle with n dots on a side; it is the sum of the n natural numbers from 1 to n...
, star number
Star number
A star number is a centered figurate number that represents a centered hexagram, such as the one that Chinese checkers is played on.The nth star number is given by the formula 6n + 1...
, centered heptagonal number
Centered heptagonal number
A centered heptagonal number is a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers...
, centered nonagonal number
Centered nonagonal number
A centered nonagonal number is a centered figurate number that represents a nonagon with a dot in the center and all other dots surrounding the center dot in successive nonagonal layers...
, Blum integer
Blum integer
In mathematics, a natural number n is a Blum integer if n = p×q is a semiprime for which p and q are distinct prime numbers congruent to 3 mod 4. That is, p and q must be of the form 4t+3, for some integer t. Primes of this form are referred to as Blum primes. This means that the factors of a Blum...
----
Two hundred [and] fifty-four 254 = 2·127, Mertens function returns 0, nontotient
----
Two hundred [and] fifty-five
255 (number)
255 is the natural number following 254 and preceding 256.-In mathematics:Its factorization makes it a sphenic number. Since 255 = 28 - 1, it is a Mersenne number, and the fourth such number not to be a prime number...
has its own article.
----
Two hundred [and] fifty-six
256 (number)
256 is the natural number following 255 and preceding 257.-In mathematics:256 is a composite number, with the factorization 256 = 28, which makes it a power of two....
has its own article.
----
Two hundred [and] fifty-seven 257 prime, Fermat prime, balanced prime, Chen prime, Eisenstein prime with no imaginary part
----
Two hundred [and] fifty-eight 258 = 2·3·43, sphenic number
Sphenic number
In number theory, a sphenic number is a positive integer which is the product of three distinct prime numbers.Note that this definition is more stringent than simply requiring the integer to have exactly three prime factors; e.g. 60 = 22 × 3 × 5 has exactly 3 prime factors, but is not sphenic.All...
, sum of four consecutive primes (59 + 61 + 67 + 71), nontotient
Nontotient
In number theory, a nontotient is a positive integer n which is not in the range of Euler's totient function φ, that is, for which φ = n has no solution. In other words, n is a nontotient if there is no integer x that has exactly n coprimes below it. All odd numbers are nontotients, except 1,...
----
Two hundred [and] fifty-nine 259 = 7·37, repdigit
Repdigit
In recreational mathematics, a repdigit is a natural number composed of repeated instances of the same digit, most often in the decimal numeral system....
in base 6 (1111).