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A024480 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (1, p(1), p(2), ...), t = (composite numbers). 0
4, 6, 20, 25, 52, 59, 113, 129, 218, 249, 409, 454, 673, 728, 1045, 1131, 1529, 1650, 2173, 2313, 3016, 3173, 3989, 4197, 5228, 5495, 6716, 7003, 8379, 8737, 10330, 10767, 12650, 13172, 15370, 15997, 18418, 19089, 21858, 22566, 25639, 26463, 29783, 30722 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..44.

CROSSREFS

Sequence in context: A123169 A205955 A023863 * A066193 A026711 A273995

Adjacent sequences:  A024477 A024478 A024479 * A024481 A024482 A024483

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 22 15:57 EST 2019. Contains 319364 sequences. (Running on oeis4.)