What is unique about the number 29?

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Problem

What is unique about the number 29?

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To get the solution, first write out the number ;

TWENTY NINE

is composed of 29 straight lines (according to standard caligraphy such
as the letters printed on your computer keyboard).

For this property, 29 is a unique number. - Sorry if this is a letdown.

-- Ivan Audouin <audouin@husc4.harvard.edu>, January 1994