A161756 - OEIS

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A161756

The sum of all numbers from n up to A002808(n)-3.

1, 5, 12, 15, 18, 30, 45, 50, 55, 75, 98, 105, 112, 140, 148, 156, 164, 172, 207, 245, 255, 265, 275, 285, 330, 341, 352, 402, 455, 468, 481, 539, 553, 567, 581, 595, 660, 675, 690, 705, 720, 792, 867, 884, 901, 918, 935, 1017, 1035, 1053, 1140, 1230, 1250, 1270, 1290 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Charles R Greathouse IV, Table of n, a(n) for n = 1..10000`
	FORMULA	`a(n) = A000217(A002808(n)-3)-A000217(n-1).`
	EXAMPLE	`a(1) = 1, a(2) = 2+3, a(3) = 3+4+5.`
	CROSSREFS	`Cf. A002808.` `Sequence in context: A066025 A009824 A087090 * A184399 A056713 A110670` `Adjacent sequences: A161753 A161754 A161755 * A161757 A161758 A161759`
	KEYWORD	`nonn,less`
	AUTHOR	`Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jun 18 2009`
	EXTENSIONS	`61 replaced by 75, 382 by 402 - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2009`

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Last modified February 15 16:56 EST 2012. Contains 205825 sequences.