“243 (number)”的意思、由来-开放百科全书

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243 (number)

释义

In mathematics
In other fields
References

243 (two hundred [and] forty-three) is the natural number following 242 and preceding 244.

In mathematics

243 is:

the only 3-digit number that is a fifth power (3⁵).
a perfect totient number.^[1]
the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59).
an 82-gonal number.
a Harshad number.

In other fields

243 is:

the Calling code for the Democratic Republic of the Congo, the country once known as Zaire.
the year 243 AD or 243 BC.
Aloha Airlines Flight 243 which suffered an explosive decompression near Maui, HI on April 28, 1988
.243 Winchester and .243 WSSM, rifle rounds
The number of Earth Days for the planet Venus to complete one Venusian day, one revolution

References

1. ^{{Cite web|url=https://oeis.org/A082897|title=Sloane's A082897 : Perfect totient numbers|last=|first=|date=|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}

1 : Integers

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