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 A156641 13*(100^(n+1)-1)/99. 1
 13, 1313, 131313, 13131313, 1313131313, 131313131313, 13131313131313, 1313131313131313, 131313131313131313, 13131313131313131313, 1313131313131313131313, 131313131313131313131313 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..100 Index entries for linear recurrences with constant coefficients, signature (101,-100). FORMULA G.f.: 13*x / ( (1-100*x)*(1-x) ). a(n) = 13*A094028(n-1). EXAMPLE For n=0, a(0)=13; n=1, a(1)=1313; n=2, a(2)=131313; n=3, a(3)=13131313 MATHEMATICA Table[FromDigits[PadLeft[{1, 3}, 2n, {1, 3}]], {n, 15}] (* Harvey P. Dale, Jul 23 2011 *) PROG (MAGMA) [13*(100^(n+1)-1)/99: n in [0..15]] CROSSREFS Cf. A094028 Sequence in context: A220619 A178560 A091781 * A300592 A221690 A197630 Adjacent sequences:  A156638 A156639 A156640 * A156642 A156643 A156644 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Feb 15 2009 EXTENSIONS Offset changed from 1 to 0 STATUS approved

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Last modified January 23 12:31 EST 2021. Contains 340385 sequences. (Running on oeis4.)