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Search: id:A018231
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| A018231 |
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Numbers n such that normalizer of Gamma_0(n) is a triangle group. |
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+0
4
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| 1, 2, 3, 4, 8, 9, 12, 16, 18, 27, 32, 36, 48, 64, 72, 108, 128, 144, 1152, 192, 1728, 576, 288, 432
(list; graph; listen)
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OFFSET
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1,2
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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, A018230.
Adjacent sequences: A018228 A018229 A018230 this_sequence A018232 A018233 A018234
Sequence in context: A032859 A032883 A023786 this_sequence A085256 A127483 A130804
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KEYWORD
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nonn
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AUTHOR
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njas
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