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Today is Day 170 of 2013

170

is the smallest number n for which phi(n) and sigma(n) are both square.

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




170

Today is day number   of 2013. Below are various representations of the number 170, 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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