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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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3
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OFFSET
| 1,1
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REFERENCES
| 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
| Cf. A018229, A018228, A018231.
Sequence in context: A061936 A074630 A033428 * A058034 A187273 A009259
Adjacent sequences: A018227 A018228 A018229 * A018231 A018232 A018233
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Corrected Apr 15 1997.
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