A082072 - cp's OEIS frontend

A082072 Smallest prime that divides sigma(n) = A000203(n) and sigma_2(n) = A001157(n), or 1 if sigma(n) and sigma_2(n) are relatively prime.

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	2
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	2
21	2
22	2
23	2
24	2
25	31
26	2
27	2
28	2
29	2
30	2
31	2
32	3
33	2
34	2
35	2
36	7
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	2
46	2
47	2
48	2
49	3
50	3
51	2
52	2
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	127
65	2
66	2
67	2
68	2
69	2
70	2
71	2
72	5
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	2
81	11
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	2
93	2
94	2
95	2
96	2
97	2
98	3
99	2
100	7
101	2
102	2

[1, 1, 2, 7, 2, 2, 2, 5, 13, 2, 2, 2, 2, 2, 2, 31, 2, 13, 2, 2, 2, 2, 2, 2, 31, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 127, 2, 2, 2, 2, 2, 2, 2, 5, 2, 2, 2, 2, 2, 2, 2, 2, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 7, 2, 2]

cp's OEIS Frontend

A082072 Smallest prime that divides sigma(n) = A000203(n) and sigma_2(n) = A001157(n), or 1 if sigma(n) and sigma_2(n) are relatively prime.

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	2
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	2
21	2
22	2
23	2
24	2
25	31
26	2
27	2
28	2
29	2
30	2
31	2
32	3
33	2
34	2
35	2
36	7
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	2
46	2
47	2
48	2
49	3
50	3
51	2
52	2
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	127
65	2
66	2
67	2
68	2
69	2
70	2
71	2
72	5
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	2
81	11
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	2
93	2
94	2
95	2
96	2
97	2
98	3
99	2
100	7
101	2
102	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	2
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	2
21	2
22	2
23	2
24	2
25	31
26	2
27	2
28	2
29	2
30	2
31	2
32	3
33	2
34	2
35	2
36	7
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	2
46	2
47	2
48	2
49	3
50	3
51	2
52	2
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	127
65	2
66	2
67	2
68	2
69	2
70	2
71	2
72	5
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	2
81	11
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	2
93	2
94	2
95	2
96	2
97	2
98	3
99	2
100	7
101	2
102	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	2
13	2
14	2
15	2
16	31
17	2
18	13
19	2
20	2
21	2
22	2
23	2
24	2
25	31
26	2
27	2
28	2
29	2
30	2
31	2
32	3
33	2
34	2
35	2
36	7
37	2
38	2
39	2
40	2
41	2
42	2
43	2
44	2
45	2
46	2
47	2
48	2
49	3
50	3
51	2
52	2
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	127
65	2
66	2
67	2
68	2
69	2
70	2
71	2
72	5
73	2
74	2
75	2
76	2
77	2
78	2
79	2
80	2
81	11
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	2
93	2
94	2
95	2
96	2
97	2
98	3
99	2
100	7
101	2
102	2