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URL: https://oeis.org/A165071

⇱ A165071 - OEIS

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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
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: A141462 A354330 A055955 * A341483 A223033 A237444
KEYWORD
base,nonn
AUTHOR
Joseph Myers, Sep 04 2009
STATUS
approved