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Search: id:A066181
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| A066181 |
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Permutation of the integers with cycle form {1}, {2, 3}, {4, 5, 6}, {7, 8, 9, 10}, ... |
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+0
2
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| 1, 3, 2, 5, 6, 4, 8, 9, 10, 7, 12, 13, 14, 15, 11, 17, 18, 19, 20, 21, 16, 23, 24, 25, 26, 27, 28, 22, 30, 31, 32, 33, 34, 35, 36, 29, 38, 39, 40, 41, 42, 43, 44, 45, 37, 47, 48, 49, 50, 51, 52, 53, 54, 55, 46, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 56, 68, 69, 70, 71, 72, 73
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Arrange natural numbers 1,2,3,4,5,... as a triangle like A000027, then rotate each row of triangle one left. - Antti Karttunen, May 07 2002
For a group of n terms a^(n)(k)= k where n(n-1)/2 < k <= n(n+1)/2. E.g. for the three terms 5, 6 and 4, a(5)= 6, a(6) = 4, a(4) = 5; a(a(a(5))) = 5 = a^(3)(5). - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 31 2003
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LINKS
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Index entries for sequences that are permutations of the natural numbers
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MATHEMATICA
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FromCycles[Table[n(n-1)/2+Range[n], {n, 13}]]
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CROSSREFS
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Inverse permutation: A066182.
Sequence in context: A115511 A026098 A135764 this_sequence A084493 A084497 A120912
Adjacent sequences: A066178 A066179 A066180 this_sequence A066182 A066183 A066184
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KEYWORD
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easy,nonn,tabl
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AUTHOR
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Wouter Meeussen (wouter.meeussen(AT)pandora.be), Dec 15 2001
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