A126213 - cp's OEIS frontend

A126213 a(n) = sum of the d(k)'s, where 1<=k<=n and d(k) is equal to any divisor of n, where d(k) is the number of positive divisors of k.

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	10
7	1
8	17
9	7
10	9
11	1
12	35
13	1
14	13
15	7
16	33
17	1
18	33
19	1
20	42
21	7
22	17
23	1
24	79
25	6
26	19
27	10
28	55
29	1
30	59
31	1
32	75
33	10
34	23
35	6
36	119
37	1
38	25
39	10
40	110
41	1
42	66
43	1
44	85
45	24
46	29
47	1
48	174
49	1
50	46
51	13
52	95
53	1
54	108
55	6
56	149
57	13
58	33
59	1
60	204
61	1
62	37
63	22
64	165
65	6
66	109
67	1
68	123
69	13
70	61
71	1
72	304
73	1
74	43
75	18
76	135
77	8

[1, 3, 1, 5, 1, 10, 1, 17, 7, 9, 1, 35, 1, 13, 7, 33, 1, 33, 1, 42, 7, 17, 1, 79, 6, 19, 10, 55, 1, 59, 1, 75, 10, 23, 6, 119, 1, 25, 10, 110, 1, 66, 1, 85, 24, 29, 1, 174, 1, 46, 13, 95, 1, 108, 6, 149, 13, 33, 1, 204, 1, 37, 22, 165, 6, 109, 1, 123, 13, 61, 1, 304, 1, 43, 18, 135, 8]

cp's OEIS Frontend

A126213 a(n) = sum of the d(k)'s, where 1<=k<=n and d(k) is equal to any divisor of n, where d(k) is the number of positive divisors of k.

Table of values

List of values

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	10
7	1
8	17
9	7
10	9
11	1
12	35
13	1
14	13
15	7
16	33
17	1
18	33
19	1
20	42
21	7
22	17
23	1
24	79
25	6
26	19
27	10
28	55
29	1
30	59
31	1
32	75
33	10
34	23
35	6
36	119
37	1
38	25
39	10
40	110
41	1
42	66
43	1
44	85
45	24
46	29
47	1
48	174
49	1
50	46
51	13
52	95
53	1
54	108
55	6
56	149
57	13
58	33
59	1
60	204
61	1
62	37
63	22
64	165
65	6
66	109
67	1
68	123
69	13
70	61
71	1
72	304
73	1
74	43
75	18
76	135
77	8

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	10
7	1
8	17
9	7
10	9
11	1
12	35
13	1
14	13
15	7
16	33
17	1
18	33
19	1
20	42
21	7
22	17
23	1
24	79
25	6
26	19
27	10
28	55
29	1
30	59
31	1
32	75
33	10
34	23
35	6
36	119
37	1
38	25
39	10
40	110
41	1
42	66
43	1
44	85
45	24
46	29
47	1
48	174
49	1
50	46
51	13
52	95
53	1
54	108
55	6
56	149
57	13
58	33
59	1
60	204
61	1
62	37
63	22
64	165
65	6
66	109
67	1
68	123
69	13
70	61
71	1
72	304
73	1
74	43
75	18
76	135
77	8

n	a(n)
1	1
2	3
3	1
4	5
5	1
6	10
7	1
8	17
9	7
10	9
11	1
12	35
13	1
14	13
15	7
16	33
17	1
18	33
19	1
20	42
21	7
22	17
23	1
24	79
25	6
26	19
27	10
28	55
29	1
30	59
31	1
32	75
33	10
34	23
35	6
36	119
37	1
38	25
39	10
40	110
41	1
42	66
43	1
44	85
45	24
46	29
47	1
48	174
49	1
50	46
51	13
52	95
53	1
54	108
55	6
56	149
57	13
58	33
59	1
60	204
61	1
62	37
63	22
64	165
65	6
66	109
67	1
68	123
69	13
70	61
71	1
72	304
73	1
74	43
75	18
76	135
77	8