factor [start[stop]

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# 1  
Old 07-16-2011
factor [start[stop]

Another question for you guys! This is so fun.

So I am playing around with the factor operation. I read in "man factor" that you can actually print a list of primes in between a range, using the syntax

factor [start[stop]]

However, every time I enter two values, it just returns the factored value. For example, if I enter "factor 10 20" it returns the factors of 10 and 20, instead of 11, 13, 17, 19.

Also, typing factor 10[20] gives an error.

Does anyone know how to use this function?
# 2  
Old 07-16-2011

On a system to which I have access:
      factor, primes - factor a number, generate large primes


      primes prints prime numbers between a lower and upper bound.  If no
      arguments are provided on the command line, primes waits for two
      numbers to be typed in.  The first number is interpreted as the lower
      bound; the second as the upper bound.  All prime numbers in the
      resulting inclusive range are printed.

excerpt from man factor on
OS, ker|rel, machine: HP-UX, B.11.11, 9000/712
Distribution        : GenericSysName [HP Release B.11.11] (see /etc/issue)

which leads to:
$ primes 10 20

Is your system different from this?

Best wishes ... cheers, drl
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