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Math Help - Spotting a pattern

  1. #1
    Newbie
    Joined
    Sep 2009
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    Spotting a pattern

    I dont understand:

    1,5,21,85... Multiply by 4 and ....?
    Last edited by mr fantastic; September 24th 2009 at 10:15 PM. Reason: Deleted the excessive and unnecessary number of smilies.
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  2. #2
    MHF Contributor
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    Multiply by 4 and add 1
    Last edited by mr fantastic; September 24th 2009 at 10:15 PM.
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