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function sigma number theory


From: n3mo
Subject: function sigma number theory
Date: Fri, 20 Nov 2009 09:19:29 -0800 (PST)

hi

I'm searching the function sigma of number theory, where it calculate the
sum of all prime factors of a number, f.e.

sigma (10)=1+2+5+10

I would like to know if it's defined in the library of octave or matlab and
how call it as a function.

thanks!
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