id:A053459 - OEIS Search Results

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Open disk numbers (version 4): a(n)= number of points (i+j/2,j*sqrt(3)/2), i,j integers (triangular grid) contained in a open disk of diameter n, centered at (1/2,0).

+0
4

0, 0, 4, 8, 14, 22, 30, 42, 60, 74, 92, 108, 130, 148, 178, 206, 230, 262, 288, 324, 364, 400, 442, 480, 522, 562, 614, 662, 712, 764, 812, 868, 922, 988, 1050, 1106, 1176, 1234, 1312, 1376, 1452, 1528, 1598, 1678, 1750, 1838, 1920, 2006, 2092, 2172, 2266 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`a(n)/(n/2)^2->Pi*2/sqrt(3)`
	CROSSREFS	`A053417, A053456-A053459.` `Adjacent sequences: A053456 A053457 A053458 this_sequence A053460 A053461 A053462` `Sequence in context: A006578 A122224 A004797 this_sequence A024398 A054347 A003682`
	KEYWORD	`easy,nonn`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 13 2000`

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

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