A164994 - OEIS

A164994

a(n) = A164993(n)/2.

0, 0, 0, 1, 0, 1, 2, 1, 0, 4, 4, 8, 4, 0, 4, 8, 4, 4, 8, 8, 8, 8, 4, 4, 8, 4, 0, 13, 16, 29, 16, 13, 26, 29, 26, 29, 16, 13, 26, 13, 0, 13, 26, 13, 16, 29, 26, 29, 26, 13, 16, 29, 16, 13, 26, 29, 32, 29, 26, 29, 32, 29, 26, 29, 26, 29, 26, 13, 16, 29, 16, 13, 32, 29, 26, 29, 16, 13, 26

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OFFSET

0,7

LINKS

Joseph Myers, Table of n, a(n) for n = 0..2187

Index entries for the Kaprekar map

MATHEMATICA

A164994[n_] := (FromDigits[ReverseSort[#], 3] - FromDigits[Sort[#], 3] & [IntegerDigits[n, 3]])/2;

Array[A164994, 100, 0] (* Paolo Xausa, Jan 24 2026 *)

CROSSREFS

Cf. A164993.

In other bases: A164884 (base 2), A165013 (base 4), A165033 (base 5), A165052 (base 6), A165072 (base 7), A165091 (base 8), A165111 (base 9), A151950 (base 10).

Sequence in context: A066426 A100887 A073592 * A394385 A269952 A361954

Adjacent sequences: A164991 A164992 A164993 * A164995 A164996 A164997

KEYWORD

base,nonn

AUTHOR

Joseph Myers, Sep 04 2009

STATUS

approved