A308707 - cp's OEIS frontend

A308707 a(n) = gcd(n, phi(n) + sigma(n)), where phi is A000010 and sigma is A000203.

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

[1, 2, 3, 1, 5, 2, 7, 1, 1, 2, 11, 4, 13, 2, 1, 1, 17, 9, 19, 10, 1, 2, 23, 4, 1, 2, 1, 4, 29, 10, 31, 1, 1, 2, 1, 1, 37, 2, 1, 2, 41, 6, 43, 4, 3, 2, 47, 4, 1, 1, 1, 2, 53, 6, 1, 8, 1, 2, 59, 4, 61, 2, 7, 1, 1, 2, 67, 2, 1, 14, 71, 3, 73, 2, 1, 4, 1, 6, 79, 2, 1, 2, 83, 4, 1, 2, 1, 44, 89, 6]

cp's OEIS Frontend

A308707 a(n) = gcd(n, phi(n) + sigma(n)), where phi is A000010 and sigma is A000203.

Table of values

List of values

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

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

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