A072379 - cp's OEIS frontend

A072379 Sum_{k<=n} (sigma(k)^2), where sigma(k) denotes the sum of the divisors of k A000203.

n	a(n)
1	1
2	10
3	26
4	75
5	111
6	255
7	319
8	544
9	713
10	1037
11	1181
12	1965
13	2161
14	2737
15	3313
16	4274
17	4598
18	6119
19	6519
20	8283
21	9307
22	10603
23	11179
24	14779
25	15740
26	17504
27	19104
28	22240
29	23140
30	28324
31	29348
32	33317
33	35621
34	38537
35	40841
36	49122
37	50566
38	54166
39	57302

[1, 10, 26, 75, 111, 255, 319, 544, 713, 1037, 1181, 1965, 2161, 2737, 3313, 4274, 4598, 6119, 6519, 8283, 9307, 10603, 11179, 14779, 15740, 17504, 19104, 22240, 23140, 28324, 29348, 33317, 35621, 38537, 40841, 49122, 50566, 54166, 57302]

cp's OEIS Frontend

A072379 Sum_{k<=n} (sigma(k)^2), where sigma(k) denotes the sum of the divisors of k A000203.

Table of values

List of values