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Search: id:A018228
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| A018228 |
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Numbers n such that normalizer of Gamma_0(n) is triangle group (2,3,inf). |
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+0
4
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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, A018230, A018231.
Sequence in context: A106575 A025620 A117218 this_sequence A138858 A076967 A111378
Adjacent sequences: A018225 A018226 A018227 this_sequence A018229 A018230 A018231
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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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