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A156641
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a(n) = 13*(100^(n+1) - 1)/99.
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2
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13, 1313, 131313, 13131313, 1313131313, 131313131313, 13131313131313, 1313131313131313, 131313131313131313, 13131313131313131313, 1313131313131313131313, 131313131313131313131313
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OFFSET
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0,1
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LINKS
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FORMULA
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G.f.: 13*x / ( (1-100*x)*(1-x) ).
E.g.f.: (13/99)*(-exp(x) + 100*exp(100*x)). - G. C. Greubel, Feb 28 2021
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EXAMPLE
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For n=0, a(0)=13; n=1, a(1)=1313; n=2, a(2)=131313; n=3, a(3)=13131313.
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MAPLE
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MATHEMATICA
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Table[FromDigits[PadLeft[{1, 3}, 2n, {1, 3}]], {n, 15}] (* Harvey P. Dale, Jul 23 2011 *)
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PROG
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(Magma) [13*(100^(n+1)-1)/99: n in [0..15]]
(Sage) [(13/99)*(10^(2*n+2) -1) for n in (0..15)] # G. C. Greubel, Feb 28 2021
(PARI) a(n) = 100^(n+1)\99*13; \\ Kevin Ryde, Mar 05 2022
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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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EXTENSIONS
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Offset changed from 1 to 0
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STATUS
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approved
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