A348392 Row sums of the irregular triangle A348389.

2, 5, 13, 18, 36, 43, 67, 85, 115, 126, 186, 199, 241, 286, 350, 367, 457, 476, 576, 639, 705, 728, 896, 946, 1024, 1105, 1245, 1274, 1484, 1515, 1675, 1774, 1876, 1981, 2269, 2306, 2420, 2537, 2817

Offset: 2

Author

Wolfdieter Lang, Oct 31 2021

Keywords

• nonn
• easy

Examples

			n = 4: Compare the row of an array with all multiples of k <= n, for k = 1,2, ..., n with the row of A348389:
All multiples of k <= 4 for k = 1..4:  [1 2 3 4|2 4|3|4] with row sum A143127(4) = 23.
A348389 row 4: [2 3 4|4] with 1, 2, 3 and 4 missing: row sum is 23 - 4*5/2  = 13. Hence a(4) = A143127(4) - A000217(4).
Also: a(4) =  A348391(4) - A153485(4) = 18 - 5 = 13.
		

Crossrefs

Cf. A000217, A002541, A143127, A348389.

Formula

a(n) = Sum_{m=1.. A002541(n)} A348389(n, m), for n >= 2.

a(n) = A143127(n) - A000217(n).

a(n) = A348391(n) - A153485(n).