How do you factor numbers like 10001 without a calculator?

[ehrenfest]

[SOLVED] factoring a number

Homework Statement

Is there a trick to factoring numbers of the form 1000...0001?
For example, how would you get 10001=73*137 without a calculator?

Homework Equations

The Attempt at a Solution

 

[olgranpappy]

seems so:

http://home.earthlink.net/~usondermann/binary.html