A262044 Partial sum of the first n odd composite numbers.

9, 24, 45, 70, 97, 130, 165, 204, 249, 298, 349, 404, 461, 524, 589, 658, 733, 810, 891, 976, 1063, 1154, 1247, 1342, 1441, 1546, 1657, 1772, 1889, 2008, 2129, 2252, 2377, 2506, 2639, 2774, 2915, 3058, 3203, 3350, 3503, 3658, 3817, 3978, 4143, 4312

Offset: 1

Author

R. J. Mathar, Sep 09 2015

Keywords

• nonn
• easy

Comments

Intersection with A002113 gives A058850.

Links

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

Crossrefs

Cf. A058850.

Programs

Maple

A262044 := proc(n)
    add(A071904(i),i=1..n) ;
end proc:

Mathematica

Accumulate[Select[Range[9,191,2],CompositeQ]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 09 2017 *)

Formula

a(n) = Sum_{i=1..n} A071904(i).