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Search: id:A075412
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| 0, 9, 1089, 110889, 11108889, 1111088889, 111110888889, 11111108888889, 1111111088888889, 111111110888888889, 11111111108888888889, 1111111111088888888889, 111111111110888888888889
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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A transformation of the Wonderful Demlo numbers (A002477).
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LINKS
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G. Villemin, Variations sur les carres
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FORMULA
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a(n) = A002277(n)^2 = (3 * A002275(n) )^2 = 9 * (A002275(n) )^2
a(n) = {111111... (2n times)} - 2*{ 111... (n times)} a(n) = A000042(2n) - 2*A000042(n). - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 21 2003
a(n)={333... (n times)}^2 ={111...(n times)}{000... (n times)} - {111... (n times)}. For example, 333^2 = 111000 - 111 = 110889. [From Kyle D. Balliet (kdballie(AT)bloomu.edu), Mar 07 2009]
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EXAMPLE
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a(2) = 33^2 = 1089.
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CROSSREFS
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Cf. A075411, A075412, A075413, A075414, A075415, A075416, A075417, A002283.
Sequence in context: A054344 A048912 A036411 this_sequence A084149 A020261 A076442
Adjacent sequences: A075409 A075410 A075411 this_sequence A075413 A075414 A075415
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KEYWORD
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easy,nonn
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AUTHOR
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Michael Taylor (michael.taylor(AT)vf.vodafone.co.uk), Sep 14 2002
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