[c-prog] Prime Factors !

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Hi to everyone!  I m a new user of this informative group. I want a 
program whose description is below: 
       A positive integer is entered through the keyboard.  A function 
is written in the program to obtain the prime factors of  the 
number "RECURSIVELY" !  For example, the prime factors of 24 are 
2,2,2,3 while those of 35 are 7 and 5 or those of 121 are 11 and 11.
 
Anybody who knows about this, please help me in this as soon as 
possible! Thank You!