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Search: id:A053411
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A053411 Circle numbers (version 1): a(n)= number of points (i,j), i,j integers, contained in a circle of diameter n, centered at the origin. +0
10
1, 1, 5, 9, 13, 21, 29, 37, 49, 69, 81, 97, 113, 137, 149, 177, 197, 225, 253, 293, 317, 349, 377, 421, 441, 489, 529, 577, 613, 665, 709, 749, 797, 861, 901, 973, 1009, 1085, 1129, 1201, 1257, 1313, 1373, 1457, 1517, 1597, 1653, 1741, 1793, 1885, 1961 (list; graph; listen)
OFFSET

0,3

COMMENT

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

CROSSREFS

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

Bisections: A000328 and A036704.

Sequence in context: A057961 A089217 A166049 this_sequence A023382 A151907 A151895

Adjacent sequences: A053408 A053409 A053410 this_sequence A053412 A053413 A053414

KEYWORD

easy,nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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