A087801 - cp's OEIS frontend

A087801 Greatest common divisor of tau(n)+sigma(n) and tau(n)*sigma(n), where tau = A000005 and sigma = A000203.

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	16
7	2
8	1
9	1
10	2
11	2
12	2
13	4
14	4
15	4
16	1
17	4
18	9
19	2
20	12
21	4
22	8
23	2
24	4
25	1
26	2
27	4
28	2
29	4
30	16
31	2
32	3
33	4
34	2
35	4
36	1
37	4
38	16
39	4
40	2
41	4
42	8
43	2
44	18
45	12
46	4
47	2
48	2
49	3
50	9
51	4
52	4
53	4
54	64
55	4
56	64
57	4
58	2
59	2
60	36
61	4
62	4
63	2
64	1
65	8
66	8
67	2
68	12
69	4
70	8
71	2
72	9
73	4
74	2
75	2
76	2
77	4
78	16
79	2
80	4
81	1
82	2
83	2
84	4
85	16
86	8
87	4
88	4
89	4
90	6
91	4
92	6
93	4
94	4
95	4
96	24

[1, 1, 2, 1, 4, 16, 2, 1, 1, 2, 2, 2, 4, 4, 4, 1, 4, 9, 2, 12, 4, 8, 2, 4, 1, 2, 4, 2, 4, 16, 2, 3, 4, 2, 4, 1, 4, 16, 4, 2, 4, 8, 2, 18, 12, 4, 2, 2, 3, 9, 4, 4, 4, 64, 4, 64, 4, 2, 2, 36, 4, 4, 2, 1, 8, 8, 2, 12, 4, 8, 2, 9, 4, 2, 2, 2, 4, 16, 2, 4, 1, 2, 2, 4, 16, 8, 4, 4, 4, 6, 4, 6, 4, 4, 4, 24]

cp's OEIS Frontend

A087801 Greatest common divisor of tau(n)+sigma(n) and tau(n)*sigma(n), where tau = A000005 and sigma = A000203.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	16
7	2
8	1
9	1
10	2
11	2
12	2
13	4
14	4
15	4
16	1
17	4
18	9
19	2
20	12
21	4
22	8
23	2
24	4
25	1
26	2
27	4
28	2
29	4
30	16
31	2
32	3
33	4
34	2
35	4
36	1
37	4
38	16
39	4
40	2
41	4
42	8
43	2
44	18
45	12
46	4
47	2
48	2
49	3
50	9
51	4
52	4
53	4
54	64
55	4
56	64
57	4
58	2
59	2
60	36
61	4
62	4
63	2
64	1
65	8
66	8
67	2
68	12
69	4
70	8
71	2
72	9
73	4
74	2
75	2
76	2
77	4
78	16
79	2
80	4
81	1
82	2
83	2
84	4
85	16
86	8
87	4
88	4
89	4
90	6
91	4
92	6
93	4
94	4
95	4
96	24

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	16
7	2
8	1
9	1
10	2
11	2
12	2
13	4
14	4
15	4
16	1
17	4
18	9
19	2
20	12
21	4
22	8
23	2
24	4
25	1
26	2
27	4
28	2
29	4
30	16
31	2
32	3
33	4
34	2
35	4
36	1
37	4
38	16
39	4
40	2
41	4
42	8
43	2
44	18
45	12
46	4
47	2
48	2
49	3
50	9
51	4
52	4
53	4
54	64
55	4
56	64
57	4
58	2
59	2
60	36
61	4
62	4
63	2
64	1
65	8
66	8
67	2
68	12
69	4
70	8
71	2
72	9
73	4
74	2
75	2
76	2
77	4
78	16
79	2
80	4
81	1
82	2
83	2
84	4
85	16
86	8
87	4
88	4
89	4
90	6
91	4
92	6
93	4
94	4
95	4
96	24

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	16
7	2
8	1
9	1
10	2
11	2
12	2
13	4
14	4
15	4
16	1
17	4
18	9
19	2
20	12
21	4
22	8
23	2
24	4
25	1
26	2
27	4
28	2
29	4
30	16
31	2
32	3
33	4
34	2
35	4
36	1
37	4
38	16
39	4
40	2
41	4
42	8
43	2
44	18
45	12
46	4
47	2
48	2
49	3
50	9
51	4
52	4
53	4
54	64
55	4
56	64
57	4
58	2
59	2
60	36
61	4
62	4
63	2
64	1
65	8
66	8
67	2
68	12
69	4
70	8
71	2
72	9
73	4
74	2
75	2
76	2
77	4
78	16
79	2
80	4
81	1
82	2
83	2
84	4
85	16
86	8
87	4
88	4
89	4
90	6
91	4
92	6
93	4
94	4
95	4
96	24