A082065 - cp's OEIS frontend

A082065 Greatest common prime-divisor of phi(n)=A000010(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	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	1
17	2
18	1
19	2
20	2
21	2
22	5
23	2
24	2
25	1
26	2
27	2
28	3
29	2
30	2
31	2
32	1
33	5
34	2
35	2
36	3
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	5
51	2
52	3
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	5
63	2
64	1
65	2
66	5
67	2
68	2
69	2
70	2
71	2
72	1
73	2
74	2
75	5
76	3
77	5
78	2
79	2
80	2
81	1
82	5
83	2
84	3
85	2
86	2
87	2
88	5
89	2
90	2
91	2
92	2
93	5
94	2
95	2
96	2
97	2
98	3
99	2
100	1

[1, 1, 2, 1, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 1, 2, 2, 2, 5, 2, 2, 1, 2, 2, 3, 2, 2, 2, 1, 5, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 5, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 5, 2, 1, 2, 5, 2, 2, 2, 2, 2, 1, 2, 2, 5, 3, 5, 2, 2, 2, 1, 5, 2, 3, 2, 2, 2, 5, 2, 2, 2, 2, 5, 2, 2, 2, 2, 3, 2, 1]

cp's OEIS Frontend

A082065 Greatest common prime-divisor of phi(n)=A000010(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	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	1
17	2
18	1
19	2
20	2
21	2
22	5
23	2
24	2
25	1
26	2
27	2
28	3
29	2
30	2
31	2
32	1
33	5
34	2
35	2
36	3
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	5
51	2
52	3
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	5
63	2
64	1
65	2
66	5
67	2
68	2
69	2
70	2
71	2
72	1
73	2
74	2
75	5
76	3
77	5
78	2
79	2
80	2
81	1
82	5
83	2
84	3
85	2
86	2
87	2
88	5
89	2
90	2
91	2
92	2
93	5
94	2
95	2
96	2
97	2
98	3
99	2
100	1

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	1
17	2
18	1
19	2
20	2
21	2
22	5
23	2
24	2
25	1
26	2
27	2
28	3
29	2
30	2
31	2
32	1
33	5
34	2
35	2
36	3
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	5
51	2
52	3
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	5
63	2
64	1
65	2
66	5
67	2
68	2
69	2
70	2
71	2
72	1
73	2
74	2
75	5
76	3
77	5
78	2
79	2
80	2
81	1
82	5
83	2
84	3
85	2
86	2
87	2
88	5
89	2
90	2
91	2
92	2
93	5
94	2
95	2
96	2
97	2
98	3
99	2
100	1

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	2
13	2
14	2
15	2
16	1
17	2
18	1
19	2
20	2
21	2
22	5
23	2
24	2
25	1
26	2
27	2
28	3
29	2
30	2
31	2
32	1
33	5
34	2
35	2
36	3
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	5
51	2
52	3
53	2
54	2
55	2
56	2
57	2
58	2
59	2
60	2
61	2
62	5
63	2
64	1
65	2
66	5
67	2
68	2
69	2
70	2
71	2
72	1
73	2
74	2
75	5
76	3
77	5
78	2
79	2
80	2
81	1
82	5
83	2
84	3
85	2
86	2
87	2
88	5
89	2
90	2
91	2
92	2
93	5
94	2
95	2
96	2
97	2
98	3
99	2
100	1