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 NAME     
 |  |  |  | factor, primes – factor a number, generate large primes 
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 SYNOPSIS     
 |  |  |  | factor [ number ] 
    
    
    primes [ start [ finish ] ] 
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 DESCRIPTION     
 |  |  |  | Factor prints number and its prime factors, each repeated the
    proper number of times. The number must be positive and less than
    254 (about 1.8×1016). 
    
    
    If no number is given, factor reads a stream of numbers from the
    standard input and factors them. It exits on any input not a positive
    integer. Maximum running time is proportional to -/n . 
    
    
    
    
    
    Primes prints the prime numbers ranging from start to finish,
    where start and finish are positive numbers less than 256. If
    finish is missing, primes prints without end; if start is missing,
    it reads the starting number from the standard input. 
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 SOURCE     
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