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Position of the circles with center at a lattice point that contain record numbers of lattice points, in the list of Loeschian numbers A003136.
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%I #5 Oct 30 2013 04:30:47

%S 1,2,5,21,34,186,454,1927,2746,11128,30906,70762,349068,830170,

%T 2278644,13219495,27373350,87615127

%N Position of the circles with center at a lattice point that contain record numbers of lattice points, in the list of Loeschian numbers A003136.

%F a(n) = k for which A230655(n) = A003136(k).

%e a(3) = 21 because A230655(3) = A003136(21) = 49.

%Y Cf. A003136 (Loeschian numbers), A230655, A075880 (similar sequence for square lattice)

%K nonn,more

%O 0,2

%A _Hugo Pfoertner_, Oct 27 2013