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 A171553 a(n) = 1+9*10^n+100^n. 4
 11, 191, 10901, 1009001, 100090001, 10000900001, 1000009000001, 100000090000001, 10000000900000001, 1000000009000000001, 100000000090000000001, 10000000000900000000001, 1000000000009000000000001, 100000000000090000000000001, 10000000000000900000000000001 (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 (111,-1110,1000). FORMULA G.f.: -(1910*x^2-1030*x+11) / ((x-1)*(10*x-1)*(100*x-1)). - Colin Barker, Jul 29 2014 MATHEMATICA Join[{11}, Table[FromDigits[Join[{1}, PadRight[{}, n, 0], {9}, PadRight[{}, n, 0], {1}]], {n, 0, 20}]] (* Harvey P. Dale, Apr 26 2013 *) Table[100^n + 9 * 10^n + 1, {n, 0, 19}] (* Alonso del Arte, Jul 28 2014 *) PROG (Magma) [1+9*10^n+100^n: n in [0..15]]; // Vincenzo Librandi, Jul 29 2014 (PARI) Vec(-(1910*x^2-1030*x+11)/((x-1)*(10*x-1)*(100*x-1)) + O(x^100)) \\ Colin Barker, Jul 29 2014 CROSSREFS Cf. A100459. Sequence in context: A036936 A002195 A280070 * A333759 A068649 A158509 Adjacent sequences: A171550 A171551 A171552 * A171554 A171555 A171556 KEYWORD easy,nonn AUTHOR Jason Earls, Dec 11 2009 EXTENSIONS More terms from Harvey P. Dale, Apr 26 2013 STATUS approved

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Last modified June 24 02:53 EDT 2024. Contains 373661 sequences. (Running on oeis4.)