id:A024850 - OEIS Search Results

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Let c(k) denotes the k-th composite number and p(k) the k-th prime number, then a(n) =sum(i=n*(n-1)/2+1,n*(n+1)/2, c(i) ) - sum(i=1,n, prime(i) ).

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2, 9, 21, 46, 84, 135, 136, 205, 308, 429, 583, 772, 987, 1265, 1552, 1906, 2308, 2767, 3278, 3840, 4478, 5201, 5956, 6783, 7704, 8706, 9777, 10976, 12241, 13591, 14985, 16546, 18230, 20019, 21862, 23824, 25907, 28111 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(1) = 4 - 2 = 2 a(2) = 6 + 8 - 2 - 3 = 9 a(3) = 9 +10 + 12 - 2 - 3 - 5 = 21`
	CROSSREFS	`a(n) = A072475(n) - A051349(n). Cf. A071411.` `Sequence in context: A005476 A131476 A023549 this_sequence A056105 A106058 A086718` `Adjacent sequences: A024847 A024848 A024849 this_sequence A024851 A024852 A024853`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy and Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 23 2002`

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

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