A060780 - cp's OEIS frontend

A060780 a(n) = gcd(sigma(n+1), sigma(n)), where sigma = A000203.

n	a(n)
1	1
2	1
3	1
4	1
5	6
6	4
7	1
8	1
9	1
10	6
11	4
12	14
13	2
14	24
15	1
16	1
17	3
18	1
19	2
20	2
21	4
22	12
23	12
24	1
25	1
26	2
27	8
28	2
29	6
30	8
31	1
32	3
33	6
34	6
35	1
36	1
37	2
38	4
39	2
40	6
41	6
42	4
43	4
44	6
45	6
46	24
47	4
48	1
49	3
50	3
51	2
52	2
53	6
54	24
55	24
56	40
57	10
58	30
59	12
60	2
61	2
62	8
63	1
64	1
65	12
66	4
67	2
68	6
69	48
70	72
71	3
72	1
73	2
74	2
75	4
76	4
77	24
78	8
79	2
80	1
81	1
82	42
83	28
84	4
85	12
86	12
87	60
88	90
89	18
90	2
91	56
92	8

[1, 1, 1, 1, 6, 4, 1, 1, 1, 6, 4, 14, 2, 24, 1, 1, 3, 1, 2, 2, 4, 12, 12, 1, 1, 2, 8, 2, 6, 8, 1, 3, 6, 6, 1, 1, 2, 4, 2, 6, 6, 4, 4, 6, 6, 24, 4, 1, 3, 3, 2, 2, 6, 24, 24, 40, 10, 30, 12, 2, 2, 8, 1, 1, 12, 4, 2, 6, 48, 72, 3, 1, 2, 2, 4, 4, 24, 8, 2, 1, 1, 42, 28, 4, 12, 12, 60, 90, 18, 2, 56, 8]

cp's OEIS Frontend

A060780 a(n) = gcd(sigma(n+1), sigma(n)), where sigma = A000203.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	6
6	4
7	1
8	1
9	1
10	6
11	4
12	14
13	2
14	24
15	1
16	1
17	3
18	1
19	2
20	2
21	4
22	12
23	12
24	1
25	1
26	2
27	8
28	2
29	6
30	8
31	1
32	3
33	6
34	6
35	1
36	1
37	2
38	4
39	2
40	6
41	6
42	4
43	4
44	6
45	6
46	24
47	4
48	1
49	3
50	3
51	2
52	2
53	6
54	24
55	24
56	40
57	10
58	30
59	12
60	2
61	2
62	8
63	1
64	1
65	12
66	4
67	2
68	6
69	48
70	72
71	3
72	1
73	2
74	2
75	4
76	4
77	24
78	8
79	2
80	1
81	1
82	42
83	28
84	4
85	12
86	12
87	60
88	90
89	18
90	2
91	56
92	8

n	a(n)
1	1
2	1
3	1
4	1
5	6
6	4
7	1
8	1
9	1
10	6
11	4
12	14
13	2
14	24
15	1
16	1
17	3
18	1
19	2
20	2
21	4
22	12
23	12
24	1
25	1
26	2
27	8
28	2
29	6
30	8
31	1
32	3
33	6
34	6
35	1
36	1
37	2
38	4
39	2
40	6
41	6
42	4
43	4
44	6
45	6
46	24
47	4
48	1
49	3
50	3
51	2
52	2
53	6
54	24
55	24
56	40
57	10
58	30
59	12
60	2
61	2
62	8
63	1
64	1
65	12
66	4
67	2
68	6
69	48
70	72
71	3
72	1
73	2
74	2
75	4
76	4
77	24
78	8
79	2
80	1
81	1
82	42
83	28
84	4
85	12
86	12
87	60
88	90
89	18
90	2
91	56
92	8

n	a(n)
1	1
2	1
3	1
4	1
5	6
6	4
7	1
8	1
9	1
10	6
11	4
12	14
13	2
14	24
15	1
16	1
17	3
18	1
19	2
20	2
21	4
22	12
23	12
24	1
25	1
26	2
27	8
28	2
29	6
30	8
31	1
32	3
33	6
34	6
35	1
36	1
37	2
38	4
39	2
40	6
41	6
42	4
43	4
44	6
45	6
46	24
47	4
48	1
49	3
50	3
51	2
52	2
53	6
54	24
55	24
56	40
57	10
58	30
59	12
60	2
61	2
62	8
63	1
64	1
65	12
66	4
67	2
68	6
69	48
70	72
71	3
72	1
73	2
74	2
75	4
76	4
77	24
78	8
79	2
80	1
81	1
82	42
83	28
84	4
85	12
86	12
87	60
88	90
89	18
90	2
91	56
92	8