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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 15 20:49 EST 2018. Contains 318154 sequences. (Running on oeis4.)