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A165106
Consider the base-8 Kaprekar map x->K(x) described in A165090. 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
7
0, 17892, 1589, 21483, 1022, 7034104602, 1445787
OFFSET
1,2
COMMENTS
Known values (to 70 base-8 digits):
a(1) = 0 (base 10) = 0 (base 8)
a(2) = 17892 (base 10) = 42744 (base 8)
a(3) = 1589 (base 10) = 3065 (base 8)
a(4) = 21483 (base 10) = 51753 (base 8)
a(5) = 1022 (base 10) = 1776 (base 8)
a(6) = 7034104602 (base 10) = 64320765432 (base 8)
a(7) = 1445787 (base 10) = 5407633 (base 8)
a(9) = 467364965130 (base 10) = 6632107665412 (base 8)
a(12) = 29921040357642 (base 10) = 663321076654412 (base 8)
CROSSREFS
In other bases: A153881 (base 2), A165008 (base 3), A165028 (base 4), A165047 (base 5), A165067 (base 6), A165086 (base 7), A165126 (base 9), A151959 (base 10).
Sequence in context: A235563 A188103 A250078 * A205661 A258957 A258950
KEYWORD
base,nonn
AUTHOR
Joseph Myers, Sep 04 2009
STATUS
approved