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A075375
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Rearrangement of natural numbers so that every term is relatively prime to the sum of its neighbors.
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1
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1, 2, 4, 3, 6, 8, 5, 9, 11, 7, 12, 10, 15, 13, 14, 16, 17, 19, 18, 22, 21, 24, 20, 23, 25, 26, 28, 27, 30, 32, 29, 31, 34, 36, 33, 35, 38, 40, 39, 37, 41, 42, 44, 43, 45, 46, 48, 49, 47, 50, 52, 51, 54, 56, 53, 55, 58, 60, 61, 57, 63, 59, 62, 64, 65, 67, 66, 70, 71, 68, 72, 69
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| If a(n) = k, define the dislocation of k to be Absolute[k-n]. Conjecture: The maximum value of dislocation < 5.
The conjecture first fails at a(169) = 164. In the first 18000 terms, the largest dislocation is 8. - David Wasserman (dwasserm(AT)earthlink.net), Jan 17 2005
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CROSSREFS
| Cf. A075376.
Sequence in context: A178898 A143529 A103867 * A191670 A065562 A120233
Adjacent sequences: A075372 A075373 A075374 * A075376 A075377 A075378
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 20 2002
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EXTENSIONS
| More terms from David Wasserman (dwasserm(AT)earthlink.net), Jan 17 2005
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