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Search: id:A018229
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| A018229 |
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Numbers n such that normalizer of Gamma_0(n) is triangle group (2,4,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. A018228, A018230, A018231.
Adjacent sequences: A018226 A018227 A018228 this_sequence A018230 A018231 A018232
Sequence in context: A051787 A081324 A050804 this_sequence A072779 A064705 A058858
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KEYWORD
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nonn
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AUTHOR
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njas
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