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Search: id:A072146
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| A072146 |
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Numbers n with property that n sets a new record for the length of the preperiodic part of the 'Reverse and Subtract' trajectory of n. |
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+0
4
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| 0, 1, 10, 13, 1011, 1013, 1028, 100103, 100107, 100184, 100368, 100484, 113008, 150703, 10000235, 10000434, 10001104, 10001285, 10001777, 10001788, 10002395, 10002494, 10109075, 1000002787, 1000011068, 1000011159, 1000012729, 1001050344
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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A072147 gives the corresponding records. Since for small n the last term of the preperiodic part is a palindrome (cf. A072137), this sequence is a weak analogue of A065198, which uses 'Reverse and Add'.
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LINKS
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Alexander Pesch (alex-physics(AT)gmx.net), May 29 2007, Table of n, a(n) for n = 1..44
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EXAMPLE
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The preperiodic part of the trajectory of 13 has length 6: 13 -> 18 -> 63 -> 27 -> 45 -> 9; for k < 13 the preperiodic part has a smaller length (at most 2).
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CROSSREFS
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Cf. A072137, A072147, A065198.
Sequence in context: A108761 A075828 A053612 this_sequence A074674 A102361 A121836
Adjacent sequences: A072143 A072144 A072145 this_sequence A072147 A072148 A072149
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KEYWORD
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base,nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jun 24 2002
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EXTENSIONS
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a(19) = 10001777 inserted by Alexander Pesch (alex-physics(AT)gmx.net), May 29 2007
Edited by njas, Dec 01 2007
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