A378056 - cp's OEIS frontend

A378056 a(n) = gcd(A057643(n), A084190(n)) = gcd(lcm{d+1 : d|n}, lcm{d-1 : d > 1 and d|n}).

n	a(n)
1	1
2	1
3	2
4	3
5	2
6	2
7	2
8	3
9	4
10	6
11	2
12	30
13	2
14	6
15	4
16	15
17	2
18	20
19	2
20	6
21	4
22	6
23	2
24	210
25	6
26	6
27	4
28	6
29	2
30	84
31	2
32	15
33	4
34	6
35	12
36	420
37	2
38	6
39	4
40	126
41	2
42	60
43	2
44	30
45	8
46	6
47	2
48	210
49	8
50	6
51	4
52	30
53	2
54	20
55	12
56	90
57	4
58	6
59	2
60	4620
61	2
62	6
63	40
64	45
65	6
66	84
67	2
68	6
69	4
70	36
71	2
72	420
73	2
74	6
75	24
76	30
77	12

[1, 1, 2, 3, 2, 2, 2, 3, 4, 6, 2, 30, 2, 6, 4, 15, 2, 20, 2, 6, 4, 6, 2, 210, 6, 6, 4, 6, 2, 84, 2, 15, 4, 6, 12, 420, 2, 6, 4, 126, 2, 60, 2, 30, 8, 6, 2, 210, 8, 6, 4, 30, 2, 20, 12, 90, 4, 6, 2, 4620, 2, 6, 40, 45, 6, 84, 2, 6, 4, 36, 2, 420, 2, 6, 24, 30, 12]

cp's OEIS Frontend

A378056 a(n) = gcd(A057643(n), A084190(n)) = gcd(lcm{d+1 : d|n}, lcm{d-1 : d > 1 and d|n}).

Table of values

List of values