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Search: id:A053415
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A053415 Circle numbers (version 3): a(n)= number of points (i,j), i,j integers, contained in a circle of diameter n, centered at (1/2,1/2). +0
9
0, 0, 4, 4, 12, 16, 32, 32, 52, 60, 80, 88, 112, 124, 156, 172, 208, 216, 256, 276, 316, 332, 384, 408, 448, 484, 540, 560, 616, 648, 716, 740, 812, 848, 912, 952, 1020, 1060, 1124, 1184, 1264, 1304, 1396, 1436, 1528, 1576, 1664, 1716, 1804, 1876, 1976 (list; graph; listen)
OFFSET

0,3

COMMENT

a(n)/(n/2)^2->Pi

CROSSREFS

Cf. A053411, A053414, A053415, A053416, A053417.

Adjacent sequences: A053412 A053413 A053414 this_sequence A053416 A053417 A053418

Sequence in context: A079315 A121189 A136485 this_sequence A079902 A120033 A097073

KEYWORD

easy,nonn

AUTHOR

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 10 2000

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.


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