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Today is Day 109 of 2019

109

is the smallest number which is palindromic in bases 5 and 9.
Using only the coins in circulation in the UK, you can pay the sum of 30 pence in 109 different ways.
The interior angle of a tetrahedron is 109° 28’.
Soap bubbles can only join each other at one or two angles: 109 or 120 degrees. No other angles are possible.

= 31 + 37 + 41 (sum of consecutive primes)
1092 = 602 + 912 (Pythagorean triple)

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




109

Today is day number   of 2019. Below are various representations of the number 109, some dating thousands of years, and some very modern.

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Chinese

Egyptian

Mayan

 

Babylonian

Greek

Abacus

Roman

 

Hex

 

Binary

 

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

 



 

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