A082066 - cp's OEIS frontend

A082066 Greatest common prime-divisor of sigma_1(n)=A000203(n) and sigma_2(n)=A001157(n); a(n)=1 if no common prime-divisor exists.

n	a(n)
1	1
2	1
3	2
4	7
5	2
6	2
7	2
8	5
9	13
10	2
11	2
12	7
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	7
21	2
22	2
23	2
24	5
25	31
26	2
27	5
28	7
29	2
30	2
31	2
32	7
33	2
34	2
35	2
36	13
37	2
38	5
39	2
40	5
41	2
42	2
43	2
44	7
45	13
46	2
47	2
48	31
49	19
50	31
51	2
52	7
53	2
54	5
55	2
56	5
57	5
58	5
59	2
60	7
61	2
62	2
63	13
64	127
65	2
66	2
67	2
68	7
69	2
70	2
71	2
72	13
73	2
74	2
75	31
76	7
77	2
78	2
79	2
80	31
81	11
82	2
83	2
84	7
85	2
86	2
87	5
88	5
89	2
90	13
91	2
92	7
93	2
94	2
95	2
96	7
97	2

[1, 1, 2, 7, 2, 2, 2, 5, 13, 2, 2, 7, 2, 2, 2, 31, 2, 13, 2, 7, 2, 2, 2, 5, 31, 2, 5, 7, 2, 2, 2, 7, 2, 2, 2, 13, 2, 5, 2, 5, 2, 2, 2, 7, 13, 2, 2, 31, 19, 31, 2, 7, 2, 5, 2, 5, 5, 5, 2, 7, 2, 2, 13, 127, 2, 2, 2, 7, 2, 2, 2, 13, 2, 2, 31, 7, 2, 2, 2, 31, 11, 2, 2, 7, 2, 2, 5, 5, 2, 13, 2, 7, 2, 2, 2, 7, 2]

cp's OEIS Frontend

A082066 Greatest common prime-divisor of sigma_1(n)=A000203(n) and sigma_2(n)=A001157(n); a(n)=1 if no common prime-divisor exists.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	7
5	2
6	2
7	2
8	5
9	13
10	2
11	2
12	7
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	7
21	2
22	2
23	2
24	5
25	31
26	2
27	5
28	7
29	2
30	2
31	2
32	7
33	2
34	2
35	2
36	13
37	2
38	5
39	2
40	5
41	2
42	2
43	2
44	7
45	13
46	2
47	2
48	31
49	19
50	31
51	2
52	7
53	2
54	5
55	2
56	5
57	5
58	5
59	2
60	7
61	2
62	2
63	13
64	127
65	2
66	2
67	2
68	7
69	2
70	2
71	2
72	13
73	2
74	2
75	31
76	7
77	2
78	2
79	2
80	31
81	11
82	2
83	2
84	7
85	2
86	2
87	5
88	5
89	2
90	13
91	2
92	7
93	2
94	2
95	2
96	7
97	2

n	a(n)
1	1
2	1
3	2
4	7
5	2
6	2
7	2
8	5
9	13
10	2
11	2
12	7
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	7
21	2
22	2
23	2
24	5
25	31
26	2
27	5
28	7
29	2
30	2
31	2
32	7
33	2
34	2
35	2
36	13
37	2
38	5
39	2
40	5
41	2
42	2
43	2
44	7
45	13
46	2
47	2
48	31
49	19
50	31
51	2
52	7
53	2
54	5
55	2
56	5
57	5
58	5
59	2
60	7
61	2
62	2
63	13
64	127
65	2
66	2
67	2
68	7
69	2
70	2
71	2
72	13
73	2
74	2
75	31
76	7
77	2
78	2
79	2
80	31
81	11
82	2
83	2
84	7
85	2
86	2
87	5
88	5
89	2
90	13
91	2
92	7
93	2
94	2
95	2
96	7
97	2

n	a(n)
1	1
2	1
3	2
4	7
5	2
6	2
7	2
8	5
9	13
10	2
11	2
12	7
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	7
21	2
22	2
23	2
24	5
25	31
26	2
27	5
28	7
29	2
30	2
31	2
32	7
33	2
34	2
35	2
36	13
37	2
38	5
39	2
40	5
41	2
42	2
43	2
44	7
45	13
46	2
47	2
48	31
49	19
50	31
51	2
52	7
53	2
54	5
55	2
56	5
57	5
58	5
59	2
60	7
61	2
62	2
63	13
64	127
65	2
66	2
67	2
68	7
69	2
70	2
71	2
72	13
73	2
74	2
75	31
76	7
77	2
78	2
79	2
80	31
81	11
82	2
83	2
84	7
85	2
86	2
87	5
88	5
89	2
90	13
91	2
92	7
93	2
94	2
95	2
96	7
97	2