A024590 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers), t = (odd natural numbers).

4, 12, 38, 58, 118, 154, 253, 307, 451, 525, 731, 829, 1109, 1235, 1586, 1742, 2170, 2358, 2888, 3112, 3756, 4020, 4767, 5073, 5929, 6279, 7277, 7675, 8798, 9246, 10500, 11000, 12391, 12945, 14479, 15089, 16809, 17479, 19397, 20131, 22218, 23018, 25280

Offset

1,1

Links

Table of n, a(n) for n=1..43.

Crossrefs

Sequence in context: A149321 A149322 A149323 * A189499 A183159 A369682

Adjacent sequences: A024587 A024588 A024589 * A024591 A024592 A024593

Keyword

nonn

Author

Clark Kimberling

Status

approved