[Cz-mathematics] FW: Sieve of Eratosthenes

[Larry Sanger]

-----Original Message-----
From:  ... 
Sent: Wednesday, November 07, 2007 12:12 PM
To: sanger at citizendium.org
Subject: Sieve of Eratosthenes


In the article on prime factors the sieve of Eratosthenes seems to have
an error:

The first number (2) is prime, so we mark it, and cross out all of its
multiples: 

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 

The number 4 is also a multiple of 2, isn't it. But it has not been
struck out. Is this an error or is it ok? 

Regards 

Smita



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