id:A154588 - OEIS Search Results

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Numbers that can be expressed as the sum of the first j integer numbers or the first k nonprime numbers, with j and k >=1.

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1, 28, 435, 10296, 415416, 1062153, 3703281, 426626655, 782002378, 102886232631, 1636197988776, 2749764593278, 61972139524851, 813577626225078, 1604393353172781, 3603538956517305, 44000970048906445, 83556903098276790, 208955344344897381 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The indices (j,k) where A000217(j) = A051349(k) are (1,1), (7,5), (29,23), (143,123), (911,823), (1457,1327), (2721,2501), (29210,27488), (39547,37295) , (453621,433381) , (1808976,1737137) , (2345107,2253859) , (11133026,10746793), (40338012,39053670), (56646153,54880858) , (84894510,82314170) , (296651209,288273745), (408795555,397457085), (646460121,628975505) [Donovan Johnson (donovan.johnson(AT)yahoo.com), 11 Sep 2009]`
	FORMULA	`(A000217 INTERSECT A051349) MINUS {0}. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 21 2009]`
	EXAMPLE	`28 = A000217(7) = A051349(5).` `435 = A000217(19) = A051349(23).` `10296 = A000217(143) = A051349(123).`
	CROSSREFS	`A007504, A051349, A066527, A133784, A154587` `Sequence in context: A093974 A121803 A022656 this_sequence A125485 A054337 A009685` `Adjacent sequences: A154585 A154586 A154587 this_sequence A154589 A154590 A154591`
	KEYWORD	`nonn`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jan 16 2009, Jan 19 2009`
	EXTENSIONS	`Replaced 10256 by 10296 and added two more terms. R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 21 2009` `Extended beyond a(9) by Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 11 2009`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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