A334663 - cp's OEIS frontend

A334663 a(n) = Sum_{d|n} gcd(sigma(d), pod(d)), where pod(k) is the product of the divisors of k (A007955).

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	15
7	2
8	4
9	3
10	5
11	2
12	20
13	2
14	7
15	6
16	5
17	2
18	19
19	2
20	8
21	4
22	7
23	2
24	33
25	3
26	5
27	4
28	64
29	2
30	93
31	2
32	6
33	6
34	5
35	4
36	25
37	2
38	7
39	4
40	19
41	2
42	69
43	2
44	12
45	10
46	7
47	2
48	38
49	3
50	7
51	12
52	8
53	2
54	44
55	4
56	73
57	4
58	5
59	2
60	124
61	2
62	7
63	6
64	7
65	4
66	167
67	2
68	8
69	6
70	27
71	2
72	41
73	2
74	5
75	8
76	12
77	4
78	43
79	2

[1, 2, 2, 3, 2, 15, 2, 4, 3, 5, 2, 20, 2, 7, 6, 5, 2, 19, 2, 8, 4, 7, 2, 33, 3, 5, 4, 64, 2, 93, 2, 6, 6, 5, 4, 25, 2, 7, 4, 19, 2, 69, 2, 12, 10, 7, 2, 38, 3, 7, 12, 8, 2, 44, 4, 73, 4, 5, 2, 124, 2, 7, 6, 7, 4, 167, 2, 8, 6, 27, 2, 41, 2, 5, 8, 12, 4, 43, 2]

cp's OEIS Frontend

A334663 a(n) = Sum_{d|n} gcd(sigma(d), pod(d)), where pod(k) is the product of the divisors of k (A007955).

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	15
7	2
8	4
9	3
10	5
11	2
12	20
13	2
14	7
15	6
16	5
17	2
18	19
19	2
20	8
21	4
22	7
23	2
24	33
25	3
26	5
27	4
28	64
29	2
30	93
31	2
32	6
33	6
34	5
35	4
36	25
37	2
38	7
39	4
40	19
41	2
42	69
43	2
44	12
45	10
46	7
47	2
48	38
49	3
50	7
51	12
52	8
53	2
54	44
55	4
56	73
57	4
58	5
59	2
60	124
61	2
62	7
63	6
64	7
65	4
66	167
67	2
68	8
69	6
70	27
71	2
72	41
73	2
74	5
75	8
76	12
77	4
78	43
79	2

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	15
7	2
8	4
9	3
10	5
11	2
12	20
13	2
14	7
15	6
16	5
17	2
18	19
19	2
20	8
21	4
22	7
23	2
24	33
25	3
26	5
27	4
28	64
29	2
30	93
31	2
32	6
33	6
34	5
35	4
36	25
37	2
38	7
39	4
40	19
41	2
42	69
43	2
44	12
45	10
46	7
47	2
48	38
49	3
50	7
51	12
52	8
53	2
54	44
55	4
56	73
57	4
58	5
59	2
60	124
61	2
62	7
63	6
64	7
65	4
66	167
67	2
68	8
69	6
70	27
71	2
72	41
73	2
74	5
75	8
76	12
77	4
78	43
79	2

n	a(n)
1	1
2	2
3	2
4	3
5	2
6	15
7	2
8	4
9	3
10	5
11	2
12	20
13	2
14	7
15	6
16	5
17	2
18	19
19	2
20	8
21	4
22	7
23	2
24	33
25	3
26	5
27	4
28	64
29	2
30	93
31	2
32	6
33	6
34	5
35	4
36	25
37	2
38	7
39	4
40	19
41	2
42	69
43	2
44	12
45	10
46	7
47	2
48	38
49	3
50	7
51	12
52	8
53	2
54	44
55	4
56	73
57	4
58	5
59	2
60	124
61	2
62	7
63	6
64	7
65	4
66	167
67	2
68	8
69	6
70	27
71	2
72	41
73	2
74	5
75	8
76	12
77	4
78	43
79	2