id:A025224 - OEIS Search Results

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Floor( Sum_{k=1..n} {sqrt(k)} ).

+0
1

0, 1, 2, 4, 6, 8, 10, 13, 16, 19, 22, 25, 29, 32, 36, 40, 44, 48, 52, 57, 61, 66, 70, 75, 80, 85, 90, 95, 101, 106, 112, 117, 123, 129, 134, 140, 146, 152, 159, 165, 171, 178, 184, 191, 197, 204, 211, 218, 224, 231, 239, 246, 253, 260, 268, 275, 282, 290, 298, 305, 313, 321, 329, 337 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Charles R Greathouse IV, Home Page [in lieu of email address]` `S. Ramanujan, "On the sum of the square roots of the first n natural numbers". Journal of the Indian Mathematical Society, VIII (1915), pp. 173-175.`
	FORMULA	`a(n) ~= floor (2/3 * (n + 1/2) - exp(-Pi / 2)) - Charles R Greathouse IV Jul 29 2007`
	CROSSREFS	`Sequence in context: A130174 A061168 A130798 this_sequence A096182 A056827 A024172` `Adjacent sequences: A025221 A025222 A025223 this_sequence A025225 A025226 A025227`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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