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== Unclear paragraph ==
The 1st paragraph under sieve imrovements is very unclear. I assume some of these restrictions come about because of the value of N mod 20 etc? This should be explained. This paragraph needs to be expanded with a better step-by-step explanation. <small>—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/210.84.56.174|210.84.56.174]] ([[User talk:210.84.56.174|talk]]) 02:52, 21 November 2007 (UTC)</small><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
:The whole article is unclear... [[Special:Contributions/24.147.47.6 |24.147.47.6 ]] ([[User talk:24.147.47.6 |talk]]) 10:55, 6 September 2008 (UTC)
