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Thread: Hard,I think!

  1. April 24th 2009, 07:36 PM #1
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    Hard,I think!

    Let sequence \{u_n\} satisfying:

    u_1=-1;u_2=-2;

    and:

    nu_{n+2}-(3n-1)u_{n+1}+2(n+2)u_n=3

    Prove that:

    2009|\sum_{i=1}^{2009} u_i +2(2^{2009}-1)
    Last edited by CaptainBlack; April 25th 2009 at 09:45 PM.
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