Two hundred eighty-four (284, CCLXXXIV) is the
Its divisors are 1, 2, 4, 71, and 142, adding up to 220, in turn, the divisors of 220 add up to 284, making the two a pair of
There is no answer to the equation φ(x) = 284, making 284 a
In other fields
284 degrees
See also the year
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number theory — Math. the study of integers and their relation to one another. Also called theory of numbers. [1910 15] * * * Branch of mathematics concerned with properties of and relations among integers. It is a popular subject among amateur mathematicians… … Universalium
.284 Winchester — Infobox Firearm Cartridge name= .284 Winchester caption= origin= USA type= rifle service= never issued used by= wars= designer= Winchester design date=1963 manufacturer=Winchester production date=1963 ndash;present number= variants= is SI… … Wikipedia
Number theory — A Lehmer sieve an analog computer once used for finding primes and solving simple diophantine equations. Number theory is a branch of pure mathematics devoted primarily to the study of the integers. Number theorists study prime numbers (the… … Wikipedia
Wikipedia:List of Wikipedians by number of edits — Shortcuts: WP:NOE WP:WBE WP:EDITS WP:MOSTEDITS This is a list of Wikipedians ordered by number of edits in the English language Wikipedia. Edits in all namespaces are counted; deleted edits have been included in recent versions. Click… … Wikipedia
New Jersey Route 284 — Route 284 NJ 284 highlighted in red Route information … Wikipedia
Pennsylvania Route 284 — PA Route 284 Route information Maintained by PennDOT Length: 9.04 mi[1 … Wikipedia
Interstate 284 — Route information Maintained by ConnDOT Length: 2.9 mi[ … Wikipedia
Amicable number — Amicable numbers are two different numbers so related that the sum of the proper divisors of the one is equal to the other, one being considered as a proper divisor but not the number itself. Such a pair is (220, 284); for the proper divisors of… … Wikipedia
Bundesstraße 284 — Basisdaten Gesamtlänge: 10 km Bundesland: Hessen … Deutsch Wikipedia
International Standard Book Number — ISBN redirects here. For usage of ISBNs in Wikipedia, see Wikipedia:ISBN. A 13 digit ISBN, 978 3 16 148410 0, as represented by an EAN 13 bar code. The International Standard Book Number (ISBN) is a unique[1][2 … Wikipedia
