A094338 (Sum of composites among next n numbers)-(sum of primes among next n numbers).

0, -5, 5, 20, 17, 39, 129, 140, 127, 305, 431, 448, 603, 777, 1037, 1540, 1313, 1951, 2373, 2450, 2861, 3407, 3975, 4656, 5329, 6073, 6951, 7092, 7983, 8091, 11063, 11290, 14695, 12749, 14143, 14276, 18495, 20201, 20571, 25612, 21065, 28283

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

a(4) = (8+9+10)-(7) =20.

Mathematica

scsp[n_]:=Module[{prs=Select[n, PrimeQ]}, Total[Complement[n, prs]]-Total[ prs]]; With[{nn=50}, scsp/@TakeList[Range[(nn(nn+1))/2], Range[nn]]]/. (1->0) (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 01 2019 *)

Crossrefs

Cf. A094337.

Sequence in context: A151789 A339320 A302176 * A205882 A099921 A139470

Adjacent sequences: A094335 A094336 A094337 * A094339 A094340 A094341

Keyword

sign

Author

Amarnath Murthy, May 17 2004

Extensions

More terms from Sean A. Irvine, Oct 13 2009

Status

approved