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Search: id:A090936
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| A090936 |
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Number of rational knots and links with n crossings with unknotting (unlinking) gap. |
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+0
2
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OFFSET
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9,3
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REFERENCES
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S. A. Bleiler, A note on unknotting number, Math. Proc. Camb. Phil. Soc. 96 (1984) 469-471.
D. Garity, Unknotting numbers are not realized in minimal projections for a class of rational knots. Proceedings of the "II Italian-Spanish Congress on General Topology and its Applications" (Trieste, 1999). Rend. Istit. Mat. Univ. Trieste 32 (2001), suppl. 2, 59-72 (2002).
Y. Nakanishi, Unknotting numbers and knot diagrams with the minimum crossings, Math. Sem. Notes Kobe Univ. 11 (1983) 257-258.
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LINKS
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D. Garity, Unknotting Numbers are not Realized in Minimal Projections for a Class of Rational Knots
S. Jablan and R. Sazdanovic, LinKnot
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EXAMPLE
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The first link with unlinking gap is 9_4^2=414.
For n=11 there are links 434,614,5132,51113, etc.
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CROSSREFS
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Cf. A090935.
Sequence in context: A097336 A014619 A097016 this_sequence A071340 A056451 A074872
Adjacent sequences: A090933 A090934 A090935 this_sequence A090937 A090938 A090939
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KEYWORD
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nonn
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AUTHOR
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Slavik Jablan and Radmila Sazdanovic (jablans(AT)mi.sanu.ac.yu), Feb 26 2004; corrected Aug 29 2004
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