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0, 9, 1089, 110889, 11108889, 1111088889, 111110888889, 11111108888889, 1111111088888889, 111111110888888889, 11111111108888888889, 1111111111088888888889, 111111111110888888888889
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OFFSET
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0,2
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COMMENTS
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A transformation of the Wonderful Demlo numbers (A002477).
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LINKS
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FORMULA
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a(n) = {333... (n times)}^2 ={111...(n times)}{000... (n times)} - {111... (n times)}. For example, 333^2 = 111000 - 111 = 110889. - Kyle D. Balliet, Mar 07 2009
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EXAMPLE
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a(2) = 33^2 = 1089.
n=1: ...................... 9 = 9 * 1;
n=2: ................... 1089 = 99 * 11;
n=3: ................. 110889 = 999 * 111;
n=4: ............... 11108889 = 9999 * 1111;
n=5: ............. 1111088889 = 99999 * 11111;
n=6: ........... 111110888889 = 999999 * 111111;
n=7: ......... 11111108888889 = 9999999 * 1111111;
n=8: ....... 1111111088888889 = 99999999 * 11111111;
n=9: ..... 111111110888888889 = 999999999 * 111111111. (End)
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MATHEMATICA
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Table[FromDigits[PadRight[{}, n, 9]]FromDigits[PadRight[{}, n, 1]], {n, 0, 15}] (* Harvey P. Dale, Feb 12 2023 *)
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CROSSREFS
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Cf. A075411, A075412, A075413, A075414, A075415, A075416, A075417, A002283, A178630, A178631, A178632, A178633, A178634, A178635, A059988.
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KEYWORD
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nonn,easy
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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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STATUS
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approved
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