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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
| 1,2
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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, A018230, A018231.
Sequence in context: A106575 A025620 A117218 * A204503 A138858 A076967
Adjacent sequences: A018225 A018226 A018227 * A018229 A018230 A018231
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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