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Math Help - a Little problem

  1. #1
    Decoder
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    a Little problem

    S1: 1
    S2: 21
    S3: 2221
    S4: 7221
    what's S5, S6...etc?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Decoder
    S1: 1
    S2: 21
    S3: 2221
    S4: 7221
    what's S5, S6...etc?
    Without any background S5, and S6.. could be anything. So tell us more
    about the origin of the problem.

    Alternatively putting a Lagrangian Interpolating Polynomial (http://mathworld.wolfram.com/Lagrang...olynomial.html)
    through the points gives S5=15641, and S6=28101.

    The Online Encyclopedia of integer sequences knows nothing of this sequence.

    RonL
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  3. #3
    Global Moderator

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    Well, it is not an arithmetic progression.
    Not a geometric progression.
    And not any exponential.

    Of course, S5, S6 can be anything.
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