id:A027916 - OEIS Search Results

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Least k such that 1+2+...+k >= E{1,2,...,n}, where E = 2nd elementary symmetric function.

+0
2

2, 5, 8, 13, 19, 25, 33, 42, 51, 62, 74, 86, 100, 115, 130, 147, 165, 183, 203, 224, 245, 268, 292, 316, 342, 369, 396, 425, 455, 485, 517, 550, 583, 618, 654, 690, 728, 767, 806, 847, 889, 931, 975, 1020, 1065, 1112, 1160, 1208, 1258, 1309, 1360, 1413, 1467 (list; graph; listen)

	OFFSET	`2,1`
	FORMULA	`G.f.: x^2(x+2)/[(1-x^3)(1-x)^2].` `a(n)=A000217(n+1)+[A049347(n)-4(n+1)]/3. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008]`
	CROSSREFS	`Sequence in context: A122221 A083704 A111097 this_sequence A054254 A025216 A076059` `Adjacent sequences: A027913 A027914 A027915 this_sequence A027917 A027918 A027919`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`
	EXTENSIONS	`Extended according to the g.f. by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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