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WordNet:

101

Note: click on a word meaning below to see its connections and related words.

The adjective has one meaning:

Meaning #1: being one more than one hundred
  Synonyms: hundred and one, a hundred and one, one hundred one, ci


 
 
Wikipedia: 101 (number)

101 (one hundred [and] one) is the natural number following 100 and preceding 102. When written without the "and," 101 is the smallest non-negative integer requiring thirteen letters in English. In the US, especially in academia, the number written or spoken with "and" is deprecated just like in "four and twenty" or "four score and seven"; "and" should only be used in a mixed number when traversing the decimal point or otherwise starting the fractional part after stating the integral part. The popularity of The 101 Dalmatians by British author, Dodie Smith, creates difficulty for US teachers in this regard.

Cardinal 101
one hundred [and] one
Ordinal 101st
one hundred [and] first
Factorization prime
Roman numeral CI
Binary 1100101
Hexadecimal 65


In mathematics

101 is the 26th prime number and a palindromic number (therefore also a palindromic prime). The next prime is 103, with which it comprises a twin prime (making 101 a Chen prime). Because the period length of its reciprocal is unique among primes, 101 is a unique prime. 101 is an Eisenstein prime with no imaginary part and real part of the form 3n - 1.

101 is the sum of five consecutive primes (13 + 17 + 19 + 23 + 29). Given 101, the Mertens function returns 0. 101 is the fifth alternating factorial.

101 is a centered decagonal number.

For a 3-digit number in base 10, this number has a relatively simple divisibility test. The number is split into groups of four, starting with the rightmost four, and added up to produce a 4-digit number. If this 4-digit number is of the form 1000a + 100b + 10a + b (where a and b are integers from 0 to 9), such as 3232 or 9797, or of the form 100b + b, such as 707 and 808, then the number is divisible by 101. This might not be as simple as the divisibility tests for numbers like 3 and 5, and it might not be terribly practical, but it is simpler than the divisibility tests for other 3-digit numbers.

On the seven-segment display of a calculator, 101 is both a strobogrammatic prime and a dihedral prime.

In science

In astronomy

In other fields

101 is also:

  • The year AD 101 or 101 BC.
  • At universities in Australia, Canada, South Africa, and the United States, often the course number of basic or entry-level courses. By extension, it is informally used elsewhere to indicate things that are meant for beginners. At universities with four-digit course numbers, the equivalent course number is 1001 or 1010. This usage is not common in the United Kingdom.
  • According to Books in Print, more books are now published with a title that begins with '101' than '100'. They usually describe or discuss a list of items, such as 101 Ways to... or 101 Questions and Answers About... . This marketing tool is used to imply that the customer is given a little extra information beyond books that include only 100 items. Some books have taken this marketing scheme even further with titles that begin with '102', '103', or '1001'. The number is used in this context as a slang term when referring to "a 101 document" what is usually referred to as a statistical survey or overview of some topic.
  • Room 101 in George Orwell's novel Nineteen Eighty-Four.
  • Room 101, a BBC comedy television series, named after Orwell.

References

  • Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): page 133zh-yue:101

 
 

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WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "101 (number)" Read more

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