A175254 - cp's OEIS frontend

A175254 a(n) = Sum_{k<=n} A000203(k)*(n-k+1), where A000203(m) is the sum of divisors of m.

n	a(n)
1	1
2	5
3	13
4	28
5	49
6	82
7	123
8	179
9	248
10	335
11	434
12	561
13	702
14	867
15	1056
16	1276
17	1514
18	1791
19	2088
20	2427
21	2798
22	3205
23	3636
24	4127
25	4649
26	5213
27	5817
28	6477
29	7167
30	7929
31	8723
32	9580
33	10485
34	11444
35	12451
36	13549
37	14685
38	15881
39	17133
40	18475
41	19859
42	21339
43	22863
44	24471
45	26157

[1, 5, 13, 28, 49, 82, 123, 179, 248, 335, 434, 561, 702, 867, 1056, 1276, 1514, 1791, 2088, 2427, 2798, 3205, 3636, 4127, 4649, 5213, 5817, 6477, 7167, 7929, 8723, 9580, 10485, 11444, 12451, 13549, 14685, 15881, 17133, 18475, 19859, 21339, 22863, 24471, 26157]

cp's OEIS Frontend

A175254 a(n) = Sum_{k<=n} A000203(k)*(n-k+1), where A000203(m) is the sum of divisors of m.

Table of values

List of values