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Search: id:A162151
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| A162151 |
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Numbers n such that m=TITO(n)>n and TITO(m)=n, where TITO() = A161594(). |
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1
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| 12, 18, 24, 27, 36, 45, 48, 132, 144, 156, 198, 264, 276, 288, 291, 297, 372, 375, 396, 405, 492, 495, 528, 576, 1089, 1212, 1236, 1287, 1356, 1359, 1452, 1572, 1584, 1629, 1683, 1728, 1812, 1818, 2002, 2067, 2079, 2178, 2304, 2424, 2532, 2676, 2721, 2727
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Or, numbers that end in two-cycles under TITO operation.
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LINKS
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Zak Seidov, 141 pairs {n,m} for n<30000
T. Khovanova, Turning Numbers Inside Out [From Tanya Khovanova (tanyakh(AT)yahoo.com), Jul 07 2009]
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FORMULA
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m=A161594(n)>n, and A161594(m)=n.
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EXAMPLE
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For smaller n's, m is a reversal of n, but for larger n's, there are other cases as well:{12,21},{18,81},{24,42},{27,72},...,{291,732},...,{372,651}, etc.
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CROSSREFS
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Cf. A161594, A161597, A161598, A161600, A161730, A161732.
Sequence in context: A171674 A031207 A107794 this_sequence A056773 A136446 A074726
Adjacent sequences: A162148 A162149 A162150 this_sequence A162152 A162153 A162154
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 26 2009
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