extract from list and keep track
- To: mathgroup at smc.vnet.net
- Subject: [mg62131] extract from list and keep track
- From: Andrea <andrea at radargift.com>
- Date: Sat, 12 Nov 2005 03:31:47 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
I'm trying to write a program for the following. Seems simple, but I'm
unable to to do it:
I have a list of increasing odd numbers. I want to create a table that
indicates which numbers in this list are 1(mod 8) and 7(mod 8) and what
position in the list these numbers have.
Then I would like to have them removed form the list to get a new (reduced)
Example: 3, 7, 9, 21, 43, 57, 63, 71, 75, 99. I want to form this a Table:
7 is 7(mod 8) and is the 2nd member in the list, 9 is 1(mod 8) and is the
3rd member in the list, etc.
The next list would become, having removed the ones in the table:
3, 21, 43, 75, 99
And I would be using some other congruence criteria. Etc.
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