A240667 - cp's OEIS frontend

A240667 a(n) is the GCD of the solutions x of sigma(x) = n; sigma(n) = A000203(n) = sum of divisors of n.

n	a(n)
1	1
2	0
3	2
4	3
5	0
6	5
7	4
8	7
9	0
10	0
11	0
12	1
13	9
14	13
15	8
16	0
17	0
18	1
19	0
20	19
21	0
22	0
23	0
24	1
25	0
26	0
27	0
28	12
29	0
30	29
31	1
32	1
33	0
34	0
35	0
36	22
37	0
38	37
39	18
40	27
41	0
42	1
43	0
44	43
45	0
46	0
47	0
48	1
49	0
50	0
51	0
52	0
53	0
54	1
55	0
56	1
57	49
58	0
59	0
60	1
61	0
62	61
63	32
64	0
65	0
66	0
67	0
68	67
69	0
70	0
71	0
72	1
73	0
74	73
75	0
76	0
77	0
78	45
79	0
80	1
81	0
82	0

[1, 0, 2, 3, 0, 5, 4, 7, 0, 0, 0, 1, 9, 13, 8, 0, 0, 1, 0, 19, 0, 0, 0, 1, 0, 0, 0, 12, 0, 29, 1, 1, 0, 0, 0, 22, 0, 37, 18, 27, 0, 1, 0, 43, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 49, 0, 0, 1, 0, 61, 32, 0, 0, 0, 0, 67, 0, 0, 0, 1, 0, 73, 0, 0, 0, 45, 0, 1, 0, 0]

cp's OEIS Frontend

A240667 a(n) is the GCD of the solutions x of sigma(x) = n; sigma(n) = A000203(n) = sum of divisors of n.

Table of values

List of values

n	a(n)
1	1
2	0
3	2
4	3
5	0
6	5
7	4
8	7
9	0
10	0
11	0
12	1
13	9
14	13
15	8
16	0
17	0
18	1
19	0
20	19
21	0
22	0
23	0
24	1
25	0
26	0
27	0
28	12
29	0
30	29
31	1
32	1
33	0
34	0
35	0
36	22
37	0
38	37
39	18
40	27
41	0
42	1
43	0
44	43
45	0
46	0
47	0
48	1
49	0
50	0
51	0
52	0
53	0
54	1
55	0
56	1
57	49
58	0
59	0
60	1
61	0
62	61
63	32
64	0
65	0
66	0
67	0
68	67
69	0
70	0
71	0
72	1
73	0
74	73
75	0
76	0
77	0
78	45
79	0
80	1
81	0
82	0

n	a(n)
1	1
2	0
3	2
4	3
5	0
6	5
7	4
8	7
9	0
10	0
11	0
12	1
13	9
14	13
15	8
16	0
17	0
18	1
19	0
20	19
21	0
22	0
23	0
24	1
25	0
26	0
27	0
28	12
29	0
30	29
31	1
32	1
33	0
34	0
35	0
36	22
37	0
38	37
39	18
40	27
41	0
42	1
43	0
44	43
45	0
46	0
47	0
48	1
49	0
50	0
51	0
52	0
53	0
54	1
55	0
56	1
57	49
58	0
59	0
60	1
61	0
62	61
63	32
64	0
65	0
66	0
67	0
68	67
69	0
70	0
71	0
72	1
73	0
74	73
75	0
76	0
77	0
78	45
79	0
80	1
81	0
82	0

n	a(n)
1	1
2	0
3	2
4	3
5	0
6	5
7	4
8	7
9	0
10	0
11	0
12	1
13	9
14	13
15	8
16	0
17	0
18	1
19	0
20	19
21	0
22	0
23	0
24	1
25	0
26	0
27	0
28	12
29	0
30	29
31	1
32	1
33	0
34	0
35	0
36	22
37	0
38	37
39	18
40	27
41	0
42	1
43	0
44	43
45	0
46	0
47	0
48	1
49	0
50	0
51	0
52	0
53	0
54	1
55	0
56	1
57	49
58	0
59	0
60	1
61	0
62	61
63	32
64	0
65	0
66	0
67	0
68	67
69	0
70	0
71	0
72	1
73	0
74	73
75	0
76	0
77	0
78	45
79	0
80	1
81	0
82	0