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Search: id:A018230
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| A018230 |
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Numbers n such that normalizer of Gamma_0(n) is triangle group (2,6,inf). |
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+0
4
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OFFSET
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1,1
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REFERENCES
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Akbas and Singerman, The signature of the normalizer..., in Graphs, Combinatorics and Geometry, ed. Liebeck and Saxl, LMSLNS 165, Cambridge Univ. Press, 1992, 77-86.
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CROSSREFS
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Cf. A018229, A018228, A018231.
Sequence in context: A061936 A074630 A033428 this_sequence A058034 A009259 A133647
Adjacent sequences: A018227 A018228 A018229 this_sequence A018231 A018232 A018233
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Corrected Apr 15 1997.
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