A348391 Row sums of irregular triangle A348390.

3, 7, 18, 24, 48, 56, 87, 109, 147, 159, 235, 249, 301, 355, 434, 452, 563, 583, 705, 779, 859, 883, 1087, 1143, 1237, 1331, 1499, 1529, 1781, 1813, 2004, 2118, 2240, 2358, 2701, 2739, 2875, 3009, 3339, 3381, 3729, 3773

Offset: 2

Author

Wolfdieter Lang, Nov 07 2021

Keywords

• nonn
• easy

Examples

			a(5) = 2 + 3 + 4 + 5 + 1 + 4 + 1 + 1 + 2 + 1 = (1 + 1 + 1 + 2 + 1) + (2 + 3 + 4 + 5 + 4) = 6 + 18 = 24.
		

Crossrefs

Cf. A002541, A348390.

Programs

Mathematica

nterms=50;Table[Total[Flatten[Table[Join[Most[Divisors[k]],Range[2k,n,k]],{k,n}]]],{n,2,nterms+1}] (* Paolo Xausa, Nov 23 2021 *)

Formula

a(n) = Sum_{m=1..2*A002541(n)} A348390(n, m), for n >= 2.

a(n) = A153485(n) + A348392(n).