id:A033551 - OEIS Search Results

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Closest integer to (Pi/4)*n^2.

+0
1

1, 3, 7, 13, 20, 28, 38, 50, 64, 79, 95, 113, 133, 154, 177, 201, 227, 254, 284, 314, 346, 380, 415, 452, 491, 531, 573, 616, 661, 707, 755, 804, 855, 908, 962, 1018, 1075, 1134, 1195, 1257, 1320, 1385, 1452, 1521 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Round( (Pi/4) * n^2 )`
	EXAMPLE	`a(3)=7, since 3^2*Pi/4 = 7.06858347.`
	CROSSREFS	`Approximation for A051233.` `Adjacent sequences: A033548 A033549 A033550 this_sequence A033552 A033553 A033554` `Sequence in context: A023230 A106080 A014283 this_sequence A022777 A033154 A076950`
	KEYWORD	`easy,nonn`
	AUTHOR	`Joe K. Crump (joecr(AT)carolina.rr.com)`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research