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Thread: Making an equation for induction

  1. September 14th 2009, 05:12 PM #1
    DeRSeD
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    Making an equation for induction

    4^(n+1) + 5^(2n−1) is always divisible by 21

    How can I make an equation that can be verified this by induction
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  2. September 15th 2009, 03:38 AM #2
    HallsofIvy
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    Quote Originally Posted by DeRSeD View Post
    4^(n+1) + 5^(2n−1) is always divisible by 21

    How can I make an equation that can be verified this by induction
    4^{n+1}+ 5^{2n-1}= 21k for some k.
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