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A018229 Numbers n such that normalizer of Gamma_0(n) is triangle group (2,4,inf). 3
2, 8, 18, 32, 72, 128, 288, 1152 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
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.
LINKS
CROSSREFS
Sequence in context: A081324 A361903 A190787 * A365265 A166830 A072779
KEYWORD
nonn,fini,full
AUTHOR
EXTENSIONS
Keywords added by Sean A. Irvine, Feb 05 2019
STATUS
approved

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)