Quandaries and Queries
 

 

What is a number that has exactly 13 factors?
 

 

Hi Mary,

One such number is 212. It's divisors are

1,2,22,23,24,25,26,27,28,29,210,211,212,

i.e.

1,2,4,8,16,32,64,128,256,512,1024,2048,4096.


612 doesn't work. 1,6,62,...,612 are divisors of 612 but so is 3.

Is 2 special or would some other number raised to the 12 power work? What numbers raised to the 12 will work?

Penny

 
 

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