A353804 - cp's OEIS frontend

A353804 Greatest common divisor of sigma(sigma(n)) and Product_{p^e||n} sigma(sigma(p^e)), where n = Product_{p^e||n}, with each p^e the maximal power of prime p that divides n.

n	a(n)
1	1
2	4
3	7
4	8
5	12
6	28
7	15
8	24
9	14
10	3
11	28
12	56
13	24
14	60
15	12
16	32
17	39
18	56
19	42
20	96
21	21
22	7
23	60
24	168
25	32
26	96
27	90
28	120
29	72
30	3
31	63
32	104
33	4
34	12
35	4
36	112
37	60
38	168
39	24
40	18
41	96
42	84
43	84
44	224
45	168
46	15
47	124
48	224
49	80
50	128
51	39
52	3
53	120
54	360
55	3
56	360
57	6
58	18
59	168
60	96
61	96
62	252
63	210
64	128
65	32
66	1
67	126
68	312
69	84
70	1
71	195
72	336
73	114
74	240
75	224
76	336

[1, 4, 7, 8, 12, 28, 15, 24, 14, 3, 28, 56, 24, 60, 12, 32, 39, 56, 42, 96, 21, 7, 60, 168, 32, 96, 90, 120, 72, 3, 63, 104, 4, 12, 4, 112, 60, 168, 24, 18, 96, 84, 84, 224, 168, 15, 124, 224, 80, 128, 39, 3, 120, 360, 3, 360, 6, 18, 168, 96, 96, 252, 210, 128, 32, 1, 126, 312, 84, 1, 195, 336, 114, 240, 224, 336]

cp's OEIS Frontend

A353804 Greatest common divisor of sigma(sigma(n)) and Product_{p^e||n} sigma(sigma(p^e)), where n = Product_{p^e||n}, with each p^e the maximal power of prime p that divides n.

Table of values

List of values

n	a(n)
1	1
2	4
3	7
4	8
5	12
6	28
7	15
8	24
9	14
10	3
11	28
12	56
13	24
14	60
15	12
16	32
17	39
18	56
19	42
20	96
21	21
22	7
23	60
24	168
25	32
26	96
27	90
28	120
29	72
30	3
31	63
32	104
33	4
34	12
35	4
36	112
37	60
38	168
39	24
40	18
41	96
42	84
43	84
44	224
45	168
46	15
47	124
48	224
49	80
50	128
51	39
52	3
53	120
54	360
55	3
56	360
57	6
58	18
59	168
60	96
61	96
62	252
63	210
64	128
65	32
66	1
67	126
68	312
69	84
70	1
71	195
72	336
73	114
74	240
75	224
76	336

n	a(n)
1	1
2	4
3	7
4	8
5	12
6	28
7	15
8	24
9	14
10	3
11	28
12	56
13	24
14	60
15	12
16	32
17	39
18	56
19	42
20	96
21	21
22	7
23	60
24	168
25	32
26	96
27	90
28	120
29	72
30	3
31	63
32	104
33	4
34	12
35	4
36	112
37	60
38	168
39	24
40	18
41	96
42	84
43	84
44	224
45	168
46	15
47	124
48	224
49	80
50	128
51	39
52	3
53	120
54	360
55	3
56	360
57	6
58	18
59	168
60	96
61	96
62	252
63	210
64	128
65	32
66	1
67	126
68	312
69	84
70	1
71	195
72	336
73	114
74	240
75	224
76	336

n	a(n)
1	1
2	4
3	7
4	8
5	12
6	28
7	15
8	24
9	14
10	3
11	28
12	56
13	24
14	60
15	12
16	32
17	39
18	56
19	42
20	96
21	21
22	7
23	60
24	168
25	32
26	96
27	90
28	120
29	72
30	3
31	63
32	104
33	4
34	12
35	4
36	112
37	60
38	168
39	24
40	18
41	96
42	84
43	84
44	224
45	168
46	15
47	124
48	224
49	80
50	128
51	39
52	3
53	120
54	360
55	3
56	360
57	6
58	18
59	168
60	96
61	96
62	252
63	210
64	128
65	32
66	1
67	126
68	312
69	84
70	1
71	195
72	336
73	114
74	240
75	224
76	336