

A093832


Values of r such that N(r)/r^2 > Pi, where N(r) is the number of integer lattice points (x,y) inside a circle of radius r.


4



1, 2, 3, 5, 10, 15, 20, 35, 51, 52, 85, 100, 230, 247, 370, 425, 489, 725, 730, 1073, 1310, 1865, 1997, 2480, 2831, 3072, 3424, 3750, 3861, 3921, 4025, 4339, 4771, 4885, 5559, 5949, 6203, 6411, 7045, 7084, 7410, 7605, 8931, 9308, 9435, 9646, 10829, 10930
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OFFSET

1,2


LINKS

David Wasserman, Table of n, a(n) for n = 1..160
Eric Weisstein's World of Mathematics, Gauss's Circle Problem


PROG

(PARI) A000328(n) = local(x, y, c, nn); c = 0; x = 0; nn = n*n; y = n; while (x < y, c += x; y; x = sqrtint(nn  y*y)); 4*(n  y) + 8*c + (2*y + 1)^2; for (n = 1, 100000, if (A000328(n) > Pi*n*n, print(n))); \\ David Wasserman, Dec 05 2006


CROSSREFS

Cf. A000328, A000328, A093837.
Sequence in context: A014192 A250746 A048315 * A050947 A037387 A256055
Adjacent sequences: A093829 A093830 A093831 * A093833 A093834 A093835


KEYWORD

nonn


AUTHOR

Eric W. Weisstein, Apr 17 2004


EXTENSIONS

Corrected and extended by David Wasserman, Dec 05 2006


STATUS

approved



