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 A276352 a(n) = 100^n - 10^n. 2
 0, 90, 9900, 999000, 99990000, 9999900000, 999999000000, 99999990000000, 9999999900000000, 999999999000000000, 99999999990000000000, 9999999999900000000000, 999999999999000000000000, 99999999999990000000000000, 9999999999999900000000000000, 999999999999999000000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..15. Index entries for linear recurrences with constant coefficients, signature (110,-1000). FORMULA a(n) = floor((1000^n)/(10^n + 1)). a(n) = A002283(n)*A011557(n). a(n) = 9*A138147(n), for n>0. a(n) = A168624(n) - 1. a(n) = Sum_{k=1..n} 9*10^(2n-k). a(n) = ((10^n)*A002283(2n))/(10^n + 1). From Chai Wah Wu, Sep 01 2016: (Start) a(n) = 110*a(n-1) - 1000*a(n-2) for n > 1. G.f.: 90*x/((10*x - 1)*(100*x - 1)). (End) MAPLE A276352:=n->100^n-10^n: seq(A276352(n), n=0..20); # Wesley Ivan Hurt, Sep 07 2016 MATHEMATICA Table[100^n - 10^n, {n, 0, 10}] (* Alonso del Arte, Aug 31 2016 *) PROG (PARI) a(n)=100^n-10^n \\ Charles R Greathouse IV, Sep 01 2016 (Magma) [100^n-10^n : n in [0..20]]; // Wesley Ivan Hurt, Sep 07 2016 CROSSREFS Cf. A002283, A011557, A138147, A168624. Sequence in context: A166804 A116273 A036257 * A203779 A359842 A295594 Adjacent sequences: A276349 A276350 A276351 * A276353 A276354 A276355 KEYWORD nonn,easy AUTHOR Carauleanu Marc, Aug 31 2016 STATUS approved

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Last modified May 23 11:57 EDT 2024. Contains 372763 sequences. (Running on oeis4.)