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Today is Day 231 of 2017

231

is a triangular number: 231 = 1 + 2 + 3 + … + 19 + 20 + 21
is also an hexagonal and an octahedral number.
is the number of partitions of 16.

is exactly the number of cubic inches in an American gallon. The fact that this is exact (by definition) makes it useful for deriving other conversion constants, for instance, that there are 12 x 12 x 12/231 = 7.4805194... gallons in one cubic foot. This removes some of the uncertainties of rounding. -- Charles Gardner, Salford, USA.

= 22 + 32 + 72 + 132 (sum of prime squares)

1/231 = 3/7 - 1/3 - 1/11

Many thanks are extended to Archimedes' Lab for their information.




231

Today is day number   of 2017. Below are various representations of the number 231, some dating thousands of years, and some very modern.

Chinese

Egyptian

Mayan

 

Babylonian

Greek

Abacus

Roman

 

Hex

 

Binary

 

Many thanks are extended to Jo Edkins for her wonderful work.

 



 

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