id:A023870 - OEIS Search Results

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a(n) = s(1)t(n)+s(2)t(n-1)+...+s(k)t(n+1-k), where k=[ (n+1)/2 ], s = (natural numbers), t = (primes).

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2, 3, 11, 17, 40, 56, 104, 136, 219, 265, 397, 475, 672, 776, 1046, 1198, 1561, 1755, 2223, 2443, 3026, 3316, 4030, 4352, 5215, 5605, 6631, 7119, 8318, 8878, 10270, 10892, 12499, 13183, 15019, 15847, 17930, 18836, 21182, 22210, 24837, 26039, 28965, 30267, 33504 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Also, a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (1, p(1), p(2), ... ).`
	CROSSREFS	`Sequence in context: A038907 A019417 A024859 this_sequence A025099 A024597 A147655` `Adjacent sequences: A023867 A023868 A023869 this_sequence A023871 A023872 A023873`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

AT&T Labs Research