

A165110


a(n) = image of n under the base9 Kaprekar map n > (n with digits sorted into descending order)  (n with digits sorted into ascending order)


31



0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 8, 16, 24, 32, 40, 48, 56, 16, 8, 0, 8, 16, 24, 32, 40, 48, 24, 16, 8, 0, 8, 16, 24, 32, 40, 32, 24, 16, 8, 0, 8, 16, 24, 32, 40, 32, 24, 16, 8, 0, 8, 16, 24, 48, 40, 32, 24, 16, 8, 0, 8, 16, 56, 48, 40, 32, 24, 16, 8, 0, 8, 64, 56, 48, 40, 32, 24, 16, 8
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OFFSET

0,10


LINKS

Indranil Ghosh, Table of n, a(n) for n = 0..59049 (terms 0..6561 from Joseph Myers)
Index entries for the Kaprekar map


EXAMPLE

For n = 11, 11_10 = 12_9. So, a(11) = 21_9  12_9 = 19  11 = 8.  Indranil Ghosh, Feb 02 2017


MATHEMATICA

a[n_] := With[{dd = IntegerDigits[n, 9]}, FromDigits[ReverseSort[dd], 9]  FromDigits[Sort[dd], 9]];
a /@ Range[0, 100] (* JeanFrançois Alcover, Jan 08 2020 *)


CROSSREFS

Cf. A165111.
In other bases: A164884 (base 2), A164993 (base 3), A165012 (base 4), A165032 (base 5), A165051 (base 6), A165071 (base 7), A165090 (base 8), A151949 (base 10).
Sequence in context: A200513 A200523 A118540 * A055959 A076350 A197617
Adjacent sequences: A165107 A165108 A165109 * A165111 A165112 A165113


KEYWORD

base,nonn


AUTHOR

Joseph Myers, Sep 04 2009


STATUS

approved



