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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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3
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OFFSET
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1,2
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REFERENCES
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M. Akbas and D. Singerman, The signature of the normalizer Gamma_0(N), in Graphs, Combinatorics and Geometry, ed. Liebeck and Saxl, LMSLNS 165, Cambridge Univ. Press, 1992, 77-86.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,fini,full
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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