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Search: id:A115659
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| A115659 |
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Permutation of natural numbers generated by 2-rowed array shown below. |
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+0
1
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| 0, 3, 1, 4, 2, 7, 5, 8, 6, 11, 9, 12, 10, 15, 13, 16, 14, 19, 17, 20, 18, 23, 21, 24, 22, 27, 25, 28, 26, 31, 29, 32, 30, 35, 33, 36, 34, 39, 37, 42, 40, 43, 41, 46, 44, 47, 45, 50, 48, 51, 49, 54, 52, 55, 53, 58, 56, 59, 57, 62, 60, 63, 61, 66, 64, 67, 65, 70, 68, 71, 69, 74, 72
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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0 3 4 7 8 11 12 15 ...a(n)=Congruent to 0 or 3 mod 4.
1 2 5 6 9 10 13 14 ...a(n)=Congruent to 1 or 2 mod 4.
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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>0, a(n+4k) = a(n) + 4k, with k>=0.
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CROSSREFS
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Cf. A090964.
Sequence in context: A139432 A115208 A067060 this_sequence A068028 A065256 A016573
Adjacent sequences: A115656 A115657 A115658 this_sequence A115660 A115661 A115662
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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 18 2006
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