Formula??

Правка en1, от travelers, 2016-05-08 10:57:34

Can we devise a formula for a series like this,

S=n+7(n-1+7(n-2+7(n-3+.........)))

when n=1 S=1 first three terms are 1,9,66 someone says it has a formula but i cant find any help!!!

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en1 Английский travelers 2016-05-08 10:57:34 206 Initial revision (published)