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Help with Delete cases

• To: mathgroup at smc.vnet.net
• Subject: [mg116223] Help with Delete cases
• From: KenR <ramsey2879 at msn.com>
• Date: Mon, 7 Feb 2011 06:06:03 -0500 (EST)

I have a list= Range[3003]  I want to delete cases of n = m(m+1) mod P
from the list, but Delete cases only deletes cases matching a pattern,
i.e.

list = DeleteCases[list,Mod[N - m(m+1)/2,P] = 0] will definitely not
work.  I want to keep list, as the same identifier, throughout since
this is within a looping process. Any suggestions?