A165028 - OEIS

A165028

Consider the base-4 Kaprekar map x->K(x) described in A165012. Sequence gives the smallest number that belongs to a cycle of length n under repeated iteration of this map, or -1 if there is no cycle of length n

0, 126, 41958

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OFFSET

1,2

COMMENTS

Known values (to 200 base-4 digits):

a(1) = 0 (base 10) = 0 (base 4)

a(2) = 126 (base 10) = 1332 (base 4)

a(3) = 41958 (base 10) = 22033212 (base 4)

LINKS

Table of n, a(n) for n=1..3.

Index entries for the Kaprekar map

CROSSREFS

Cf. A165012, A165016, A165017, A165019, A165021, A165023.

In other bases: A153881 (base 2), A165008 (base 3), A165047 (base 5), A165067 (base 6), A165086 (base 7), A165106 (base 8), A165126 (base 9), A151959 (base 10).

Sequence in context: A027491 A289326 A295838 * A364402 A295816 A213405

Adjacent sequences: A165025 A165026 A165027 * A165029 A165030 A165031

KEYWORD

base,nonn,bref

AUTHOR

Joseph Myers, Sep 04 2009

STATUS

approved