id:A023536 - OEIS Search Results

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Convolution of natural numbers with A023532.

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1, 2, 4, 7, 10, 14, 19, 25, 31, 38, 46, 55, 65, 75, 86, 98, 111, 125, 140, 155, 171, 188, 206, 225, 245, 266, 287, 309, 332, 356, 381, 407, 434, 462, 490, 519, 549, 580, 612, 645, 679, 714, 750, 786, 823, 861, 900, 940, 981, 1023, 1066, 1110, 1155 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = (n(n + 5) - 4 )/2 - sum(k=2 to n) Floor(1/2 + sqrt(2(k + 2))). - Jan Hagberg (jan.hagberg(AT)stat.su.se), Oct 16 2002` `a(n)=(n+1)(n+2)/2-sum{k=1..n+1, floor((sqrt(8k+1)-1)/2)}; a(n)=sum{k=1..n+1, k-floor((sqrt(8k+1)-1)/2)}. - Paul Barry (pbarry(AT)wit.ie), May 24 2004`
	CROSSREFS	`Cf. A005230.` `Sequence in context: A022776 A025704 A025710 this_sequence A024536 A094281 A076101` `Adjacent sequences: A023533 A023534 A023535 this_sequence A023537 A023538 A023539`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`
	EXTENSIONS	`Corrected by Jan Hagberg (jan.hagberg(AT)stat.su.se), Oct 16 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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