A378053 - cp's OEIS frontend

A378053 a(n) = gcd(Product_{d|n} (d + 1), Product_{d|n, d>1} (d - 1)) = gcd(A020696(n), A377484(n)).

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	2
7	2
8	3
9	16
10	36
11	2
12	30
13	4
14	6
15	16
16	45
17	4
18	80
19	2
20	108
21	16
22	6
23	2
24	210
25	24
26	12
27	32
28	18
29	4
30	1008
31	2
32	45
33	64
34	12
35	48
36	8400
37	4
38	18
39	16
40	2268
41	4
42	240
43	2
44	90
45	512
46	18
47	2
48	3150
49	32
50	216
51	64
52	540
53	4
54	160
55	144
56	2430
57	32
58	12
59	2
60	166320
61	4
62	6
63	1280
64	405
65	48
66	1344

[1, 1, 2, 3, 4, 2, 2, 3, 16, 36, 2, 30, 4, 6, 16, 45, 4, 80, 2, 108, 16, 6, 2, 210, 24, 12, 32, 18, 4, 1008, 2, 45, 64, 12, 48, 8400, 4, 18, 16, 2268, 4, 240, 2, 90, 512, 18, 2, 3150, 32, 216, 64, 540, 4, 160, 144, 2430, 32, 12, 2, 166320, 4, 6, 1280, 405, 48, 1344]

cp's OEIS Frontend

A378053 a(n) = gcd(Product_{d|n} (d + 1), Product_{d|n, d>1} (d - 1)) = gcd(A020696(n), A377484(n)).

Table of values

List of values