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Today is Day 56 of 2017

56

is a tetrahedral number:
= 1 + 3 + 6 + 10 + 15 + 21 (sum of the first 6 triangular numbers)

is the maximal number of regions into which 10 lines divide a plane.

is the number of reduced 5 x 5 Latin squares.

is the 12th term of the partition numbers, which count the number of ways of placing N indistinguishable items into N indistinguishable urns (but with no empty urns).

56.9612484322608203... is the value of x, for which xx=10100. It is therefore the biggest number you can raise to its own power on most scientific calculators.

(111+1)/(1+1) = 56
(222+2)/(2+2) = 56
(333+3)/(3+3) = 56
...
(999+9)/(9+9) = 56

The '56 Aubrey Holes' are one of the oldest features of Stonehenge. They are 56 holes arranged in a circle, but their purpose is still unknown.

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




56

Today is day number   of 2017. Below are various representations of the number 56, 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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[Added June 2009]

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