id:A046992 - OEIS Search Results

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a(n) = sum_{k=1..n} pi(k) (cf. A000720).

+0
8

0, 1, 3, 5, 8, 11, 15, 19, 23, 27, 32, 37, 43, 49, 55, 61, 68, 75, 83, 91, 99, 107, 116, 125, 134, 143, 152, 161, 171, 181, 192, 203, 214, 225, 236, 247, 259, 271, 283, 295, 308, 321, 335, 349, 363, 377, 392, 407, 422, 437, 452, 467, 483, 499, 515, 531, 547, 563, 580, 597, 615, 633, 651, 669 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	MATHEMATICA	`f[n_] := (f[n - 1] + PrimePi[n]); f[1] = 0; Table[ f[n], {n, 1, 60}]`
	CROSSREFS	`Adjacent sequences: A046989 A046990 A046991 this_sequence A046993 A046994 A046995` `Sequence in context: A003311 A108279 A002821 this_sequence A001463 A024169 A078126`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`njas, Robert G. Wilson v (rgwv(AT)rgwv.com)`
	EXTENSIONS	`Corrected by Henry Bottomley (SE16(AT)btinternet.com)`

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Last modified October 16 16:43 EDT 2008. Contains 145098 sequences.

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