A024588 a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers).

16, 24, 68, 84, 158, 180, 289, 330, 474, 534, 735, 810, 1072, 1158, 1474, 1586, 1958, 2093, 2543, 2697, 3238, 3403, 4013, 4208, 4896, 5128, 5918, 6164, 7046, 7337, 8311, 8645, 9717, 10097, 11269, 11691, 12996, 13443, 14891, 15352, 16909, 17422, 19104, 19674, 21478

Offset

1,1

Links

Table of n, a(n) for n=1..45.

Crossrefs

Cf. A002808 (composite numbers).

Sequence in context: A162819 A029720 A204696 * A334229 A335296 A358447

Adjacent sequences: A024585 A024586 A024587 * A024589 A024590 A024591

Keyword

nonn

Author

Clark Kimberling

Extensions

a(26) corrected by Sean A. Irvine, Jul 17 2019

Status

approved