A071384 Radii of the circles around (0,0) that contain record numbers of lattice points, rounded up to the next integer.

0, 1, 3, 5, 9, 19, 34, 65, 75, 167, 269, 372, 401, 896, 1444, 2002, 2435, 5445, 8779, 12175, 15591, 34862, 56213, 77953, 113501, 231769, 253794, 409231, 567501, 886464, 1687299, 1982193, 3196190, 4432317, 7146896, 13178226, 15980946

Offset

1,3

Comments

a(n)^2 = A071383(n) for a(n) = 1, 5, 65, ... .

Links

Ray Chandler, Table of n, a(n) for n = 1..425

Hugo Pfoertner, Construction of A071383, A071384, A071385

Formula

a(n) = ceiling ( A071383(n)^(1/2) ).

Crossrefs

Cf. A071383, A071385, A046109.

Sequence in context: A192230 A291222 A339916 * A291398 A078066 A018002

Adjacent sequences: A071381 A071382 A071383 * A071385 A071386 A071387

Keyword

nonn

Author

Hugo Pfoertner, May 23 2002

Extensions

Description clarified by Günter Rote, Sep 13 2023

Status

approved