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).

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

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