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Search: id:A115302
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| A115302 |
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Permutation of natural numbers generated by 3-rowed array shown below. |
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+0
6
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| 1, 4, 2, 7, 5, 3, 10, 8, 6, 13, 11, 9, 16, 14, 12, 19, 17, 15, 22, 20, 18, 25, 23, 21, 28, 26, 24, 31, 29, 27, 34, 32, 30, 37, 35, 33, 40, 38, 36, 43, 41, 39, 46, 44, 42, 49, 47, 45, 52, 50, 48, 55, 53, 51, 58, 56, 54, 61, 59, 57, 64, 62, 60
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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1 4 7 10 13 16 19 22 25...a(n)=3n+1 => A016777
2 5 8 11 14 17 20 23 26...a(n)=3n+2 => A016789
3 6 9 12 15 18 21 24 27...a(n)=3n => A008585
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REFERENCES
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M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997
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FORMULA
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For n > 1, a(n+5) = a(n) + 6, iff a(n+5)<a(n): a(n+3k) = a(n) + 3k with k >=1.
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CROSSREFS
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Cf. A088520, A090243, A090298.
Sequence in context: A138754 A021963 A131914 this_sequence A109857 A002560 A124908
Adjacent sequences: A115299 A115300 A115301 this_sequence A115303 A115304 A115305
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KEYWORD
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easy,nonn
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Mar 05 2006
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