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 A165071 a(n) = image of n under the base-7 Kaprekar map n -> (n with digits sorted into descending order) - (n with digits sorted into ascending order) 30
 0, 0, 0, 0, 0, 0, 0, 6, 0, 6, 12, 18, 24, 30, 12, 6, 0, 6, 12, 18, 24, 18, 12, 6, 0, 6, 12, 18, 24, 18, 12, 6, 0, 6, 12, 30, 24, 18, 12, 6, 0, 6, 36, 30, 24, 18, 12, 6, 0, 48, 48, 96, 144, 192, 240, 288, 48, 0, 48, 96, 144, 192, 240, 96, 48, 48, 96, 144, 192, 240, 144, 96, 96, 96 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,8 LINKS Indranil Ghosh, Table of n, a(n) for n = 0..16807 (terms 0..2401 from Joseph Myers) EXAMPLE For n = 11, 11_10 = 14_7. So, a(11) = 41_7 - 14_7 = 29 - 11 = 18. - Indranil Ghosh, Feb 02 2017 MATHEMATICA a[n_] := With[{dd = IntegerDigits[n, 7]}, FromDigits[ReverseSort[dd], 7] - FromDigits[Sort[dd], 7]]; a /@ Range[0, 100] (* Jean-François Alcover, Jan 08 2020 *) CROSSREFS Cf. A165072. In other bases: A164884 (base 2), A164993 (base 3), A165012 (base 4), A165032 (base 5), A165051 (base 6), A165090 (base 8), A165110 (base 9), A151949 (base 10). Sequence in context: A198752 A141462 A055955 * A223033 A237444 A222918 Adjacent sequences:  A165068 A165069 A165070 * A165072 A165073 A165074 KEYWORD base,nonn AUTHOR Joseph Myers, Sep 04 2009 STATUS approved

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Last modified October 26 21:08 EDT 2020. Contains 338027 sequences. (Running on oeis4.)