S1: 1

S2: 21

S3: 2221

S4: 7221

what's S5, S6...etc?

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- December 30th 2005, 09:29 AMDecodera Little problem
S1: 1

S2: 21

S3: 2221

S4: 7221

what's S5, S6...etc? - December 30th 2005, 10:08 AMCaptainBlackQuote:

Originally Posted by**Decoder**

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 - December 30th 2005, 10:42 AMThePerfectHacker
Well, it is not an arithmetic progression.

Not a geometric progression.

And not any exponential.

Of course, S5, S6 can be anything.