A077099 - cp's OEIS frontend

A077099 a(n) = gcd(A051612(n), A065387(n)), where A051612(n) = sigma(n) - phi(n) and A065387(n) = sigma(n) + phi(n).

n	a(n)
1	2
2	2
3	2
4	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	8
13	2
14	6
15	16
16	1
17	2
18	3
19	2
20	2
21	4
22	2
23	2
24	4
25	1
26	6
27	2
28	4
29	2
30	16
31	2
32	1
33	4
34	2
35	24
36	1
37	2
38	6
39	16
40	2
41	2
42	12
43	2
44	8
45	6
46	2
47	2
48	4
49	3
50	1
51	8
52	2
53	2
54	6
55	16
56	48
57	4
58	2
59	2
60	8
61	2
62	6
63	4
64	1
65	12
66	4
67	2
68	2
69	4
70	24
71	2
72	3
73	2
74	6
75	4
76	8
77	12
78	48
79	2
80	2
81	1
82	2
83	2
84	8
85	4
86	6
87	16
88	20
89	2
90	6
91	8
92	4
93	4
94	2
95	48
96	4
97	2
98	3

[2, 2, 2, 1, 2, 2, 2, 1, 1, 2, 2, 8, 2, 6, 16, 1, 2, 3, 2, 2, 4, 2, 2, 4, 1, 6, 2, 4, 2, 16, 2, 1, 4, 2, 24, 1, 2, 6, 16, 2, 2, 12, 2, 8, 6, 2, 2, 4, 3, 1, 8, 2, 2, 6, 16, 48, 4, 2, 2, 8, 2, 6, 4, 1, 12, 4, 2, 2, 4, 24, 2, 3, 2, 6, 4, 8, 12, 48, 2, 2, 1, 2, 2, 8, 4, 6, 16, 20, 2, 6, 8, 4, 4, 2, 48, 4, 2, 3]

cp's OEIS Frontend

A077099 a(n) = gcd(A051612(n), A065387(n)), where A051612(n) = sigma(n) - phi(n) and A065387(n) = sigma(n) + phi(n).

Table of values

List of values

n	a(n)
1	2
2	2
3	2
4	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	8
13	2
14	6
15	16
16	1
17	2
18	3
19	2
20	2
21	4
22	2
23	2
24	4
25	1
26	6
27	2
28	4
29	2
30	16
31	2
32	1
33	4
34	2
35	24
36	1
37	2
38	6
39	16
40	2
41	2
42	12
43	2
44	8
45	6
46	2
47	2
48	4
49	3
50	1
51	8
52	2
53	2
54	6
55	16
56	48
57	4
58	2
59	2
60	8
61	2
62	6
63	4
64	1
65	12
66	4
67	2
68	2
69	4
70	24
71	2
72	3
73	2
74	6
75	4
76	8
77	12
78	48
79	2
80	2
81	1
82	2
83	2
84	8
85	4
86	6
87	16
88	20
89	2
90	6
91	8
92	4
93	4
94	2
95	48
96	4
97	2
98	3

n	a(n)
1	2
2	2
3	2
4	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	8
13	2
14	6
15	16
16	1
17	2
18	3
19	2
20	2
21	4
22	2
23	2
24	4
25	1
26	6
27	2
28	4
29	2
30	16
31	2
32	1
33	4
34	2
35	24
36	1
37	2
38	6
39	16
40	2
41	2
42	12
43	2
44	8
45	6
46	2
47	2
48	4
49	3
50	1
51	8
52	2
53	2
54	6
55	16
56	48
57	4
58	2
59	2
60	8
61	2
62	6
63	4
64	1
65	12
66	4
67	2
68	2
69	4
70	24
71	2
72	3
73	2
74	6
75	4
76	8
77	12
78	48
79	2
80	2
81	1
82	2
83	2
84	8
85	4
86	6
87	16
88	20
89	2
90	6
91	8
92	4
93	4
94	2
95	48
96	4
97	2
98	3

n	a(n)
1	2
2	2
3	2
4	1
5	2
6	2
7	2
8	1
9	1
10	2
11	2
12	8
13	2
14	6
15	16
16	1
17	2
18	3
19	2
20	2
21	4
22	2
23	2
24	4
25	1
26	6
27	2
28	4
29	2
30	16
31	2
32	1
33	4
34	2
35	24
36	1
37	2
38	6
39	16
40	2
41	2
42	12
43	2
44	8
45	6
46	2
47	2
48	4
49	3
50	1
51	8
52	2
53	2
54	6
55	16
56	48
57	4
58	2
59	2
60	8
61	2
62	6
63	4
64	1
65	12
66	4
67	2
68	2
69	4
70	24
71	2
72	3
73	2
74	6
75	4
76	8
77	12
78	48
79	2
80	2
81	1
82	2
83	2
84	8
85	4
86	6
87	16
88	20
89	2
90	6
91	8
92	4
93	4
94	2
95	48
96	4
97	2
98	3