A061502 - cp's OEIS frontend

A061502 a(n) = Sum_{k<=n} tau(k)^2, where tau = number of divisors function A000005.

n	a(n)
1	1
2	5
3	9
4	18
5	22
6	38
7	42
8	58
9	67
10	83
11	87
12	123
13	127
14	143
15	159
16	184
17	188
18	224
19	228
20	264
21	280
22	296
23	300
24	364
25	373
26	389
27	405
28	441
29	445
30	509
31	513
32	549
33	565
34	581
35	597
36	678
37	682
38	698
39	714
40	778
41	782
42	846
43	850
44	886
45	922
46	938
47	942
48	1042
49	1051
50	1087

[1, 5, 9, 18, 22, 38, 42, 58, 67, 83, 87, 123, 127, 143, 159, 184, 188, 224, 228, 264, 280, 296, 300, 364, 373, 389, 405, 441, 445, 509, 513, 549, 565, 581, 597, 678, 682, 698, 714, 778, 782, 846, 850, 886, 922, 938, 942, 1042, 1051, 1087]

cp's OEIS Frontend

A061502 a(n) = Sum_{k<=n} tau(k)^2, where tau = number of divisors function A000005.

Table of values

List of values