id:A081467 - OEIS Search Results

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a(n) = smallest (n+k) such that n divides the sum {(n+1)+ (n+2) + ... (n+k)} or n divides kn + k(k+1)/2.

+0
6

2, 5, 5, 11, 9, 9, 13, 23, 17, 14, 21, 20, 25, 21, 20, 47, 33, 26, 37, 35, 27, 33, 45, 39, 49, 38, 53, 35, 57, 45, 61, 95, 44, 50, 49, 44, 73, 57, 51, 55, 81, 62, 85, 76, 54, 69, 93, 80, 97, 74, 68, 91, 105, 81, 65, 104, 75, 86, 117, 75 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(4) = 11 as 4 divides 5+6+7+8+9+10+11 and not a smaller sum.`
	CROSSREFS	`Cf. A081468, A081469, A081470, A081471, A081472.` `Sequence in context: A132295 A086651 A074495 this_sequence A084721 A138316 A124201` `Adjacent sequences: A081464 A081465 A081466 this_sequence A081468 A081469 A081470`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 23 2003`
	EXTENSIONS	`More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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