Search: id:A059988
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%I A059988
%S A059988 0,81,9801,998001,99980001,9999800001,999998000001,99999980000001,
%T A059988 9999999800000001,999999998000000001,99999999980000000001,
%U A059988 9999999999800000000001,999999999998000000000001
%N A059988 (10^n-1)^2.
%H A059988 Harry J. Smith, <a href="b059988.txt">Table of n, a(n) for n=0,...,200</
               a>
%F A059988 a(n) = 81*A002477(n) = A002283(n)^2 = (9*A002275(n))^2.
%F A059988 a(n)={999... (n times)}^2={999... (n times),000... (n times)} - {999... 
               (n times)}. For example, 999^2=999000-999=998001. [From Kyle D. Balliet 
               (kdballie(AT)bloomu.edu), Mar 07 2009]
%o A059988 (PARI) { for (n=0, 200, write("b059988.txt", n, " ", (10^n - 1)^2); ) 
               } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 01 2009]
%Y A059988 Cf. A075411, A075412, A075413, A075414, A075415, A075416, A075417.
%Y A059988 Sequence in context: A115443 A034993 A093281 this_sequence A017020 A058422 
               A053913
%Y A059988 Adjacent sequences: A059985 A059986 A059987 this_sequence A059989 A059990 
               A059991
%K A059988 easy,nonn
%O A059988 0,2
%A A059988 Henry Bottomley (se16(AT)btinternet.com), Mar 07 2001

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