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July 11th, 2009, 03:56 AM  #1 
Newbie Joined: Apr 2009 Posts: 5 Thanks: 0  Serial position of a composite number
I need a software/web based utility that would provide the serial position of a composite number among the composite numbers. For example, providing it with 27 it would return 17.

July 11th, 2009, 05:57 AM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 937 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Serial position of a composite number
1. Download Pari/gp (link in my sig; use the windows installer if you're on windows!) 2. Type or paste in the following program: Code: position(n)=nprimepi(n)1 

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