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Number of distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle, using only a compass.
6

%I #6 May 10 2024 08:49:26

%S 3,15,36,69,123,180,264,339,453,549,702,807,999,1128,1329,1494,1749,

%T 1935,2214,2373,2682,2940,3288,3483

%N Number of distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle, using only a compass.

%C See A372614 for images of the circles.

%Y Cf. A372614, A372615, A359931, A360350, A361622, A365669.

%K nonn,more

%O 0,1

%A _Scott R. Shannon_, May 10 2024