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Search: id:A059988
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| 0, 81, 9801, 998001, 99980001, 9999800001, 999998000001, 99999980000001, 9999999800000001, 999999998000000001, 99999999980000000001, 9999999999800000000001, 999999999998000000000001
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,200
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FORMULA
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a(n) = 81*A002477(n) = A002283(n)^2 = (9*A002275(n))^2.
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]
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PROGRAM
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(PARI) { for (n=0, 200, write("b059988.txt", n, " ", (10^n - 1)^2); ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 01 2009]
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CROSSREFS
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Cf. A075411, A075412, A075413, A075414, A075415, A075416, A075417.
Sequence in context: A115443 A034993 A093281 this_sequence A017020 A058422 A053913
Adjacent sequences: A059985 A059986 A059987 this_sequence A059989 A059990 A059991
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KEYWORD
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easy,nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Mar 07 2001
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