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A013733
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a(n) = 3^(3n+2).
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5
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9, 243, 6561, 177147, 4782969, 129140163, 3486784401, 94143178827, 2541865828329, 68630377364883, 1853020188851841, 50031545098999707, 1350851717672992089, 36472996377170786403, 984770902183611232881, 26588814358957503287787
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OFFSET
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0,1
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COMMENTS
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Additive digital root of a(n) is equal to 9. - Miquel Cerda, Oct 31 2016
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LINKS
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FORMULA
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a(n)=27*a(n-1), n>0 ; a(0)=9 . G.f.: 9/(1-27*x). - Philippe Deléham, Nov 25 2008
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MAPLE
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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