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%I #8 Feb 05 2019 21:05:27
%S 1,4,9,16,36,64,144,576
%N Numbers n such that normalizer of Gamma_0(n) is triangle group (2,3,inf).
%D 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.
%Y Cf. A018229, A018230, A018231.
%K nonn,fini,full
%O 1,2
%A _N. J. A. Sloane_.
%E Keywords added by _Sean A. Irvine_, Feb 05 2019
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