A344695 - cp's OEIS frontend

A344695 a(n) = gcd(sigma(n), psi(n)), where sigma is the sum of divisors function, A000203, and psi is the Dedekind psi function, A001615.

n	a(n)
1	1
2	3
3	4
4	1
5	6
6	12
7	8
8	3
9	1
10	18
11	12
12	4
13	14
14	24
15	24
16	1
17	18
18	3
19	20
20	6
21	32
22	36
23	24
24	12
25	1
26	42
27	4
28	8
29	30
30	72
31	32
32	3
33	48
34	54
35	48
36	1
37	38
38	60
39	56
40	18
41	42
42	96
43	44
44	12
45	6
46	72
47	48
48	4
49	1
50	3
51	72
52	14
53	54
54	12
55	72
56	24
57	80
58	90
59	60
60	24
61	62
62	96
63	8
64	1
65	84
66	144
67	68
68	18
69	96
70	144
71	72
72	3
73	74
74	114
75	4
76	20
77	96
78	168
79	80
80	6
81	1
82	126
83	84
84	32
85	108

[1, 3, 4, 1, 6, 12, 8, 3, 1, 18, 12, 4, 14, 24, 24, 1, 18, 3, 20, 6, 32, 36, 24, 12, 1, 42, 4, 8, 30, 72, 32, 3, 48, 54, 48, 1, 38, 60, 56, 18, 42, 96, 44, 12, 6, 72, 48, 4, 1, 3, 72, 14, 54, 12, 72, 24, 80, 90, 60, 24, 62, 96, 8, 1, 84, 144, 68, 18, 96, 144, 72, 3, 74, 114, 4, 20, 96, 168, 80, 6, 1, 126, 84, 32, 108]

cp's OEIS Frontend

A344695 a(n) = gcd(sigma(n), psi(n)), where sigma is the sum of divisors function, A000203, and psi is the Dedekind psi function, A001615.

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	1
5	6
6	12
7	8
8	3
9	1
10	18
11	12
12	4
13	14
14	24
15	24
16	1
17	18
18	3
19	20
20	6
21	32
22	36
23	24
24	12
25	1
26	42
27	4
28	8
29	30
30	72
31	32
32	3
33	48
34	54
35	48
36	1
37	38
38	60
39	56
40	18
41	42
42	96
43	44
44	12
45	6
46	72
47	48
48	4
49	1
50	3
51	72
52	14
53	54
54	12
55	72
56	24
57	80
58	90
59	60
60	24
61	62
62	96
63	8
64	1
65	84
66	144
67	68
68	18
69	96
70	144
71	72
72	3
73	74
74	114
75	4
76	20
77	96
78	168
79	80
80	6
81	1
82	126
83	84
84	32
85	108

n	a(n)
1	1
2	3
3	4
4	1
5	6
6	12
7	8
8	3
9	1
10	18
11	12
12	4
13	14
14	24
15	24
16	1
17	18
18	3
19	20
20	6
21	32
22	36
23	24
24	12
25	1
26	42
27	4
28	8
29	30
30	72
31	32
32	3
33	48
34	54
35	48
36	1
37	38
38	60
39	56
40	18
41	42
42	96
43	44
44	12
45	6
46	72
47	48
48	4
49	1
50	3
51	72
52	14
53	54
54	12
55	72
56	24
57	80
58	90
59	60
60	24
61	62
62	96
63	8
64	1
65	84
66	144
67	68
68	18
69	96
70	144
71	72
72	3
73	74
74	114
75	4
76	20
77	96
78	168
79	80
80	6
81	1
82	126
83	84
84	32
85	108

n	a(n)
1	1
2	3
3	4
4	1
5	6
6	12
7	8
8	3
9	1
10	18
11	12
12	4
13	14
14	24
15	24
16	1
17	18
18	3
19	20
20	6
21	32
22	36
23	24
24	12
25	1
26	42
27	4
28	8
29	30
30	72
31	32
32	3
33	48
34	54
35	48
36	1
37	38
38	60
39	56
40	18
41	42
42	96
43	44
44	12
45	6
46	72
47	48
48	4
49	1
50	3
51	72
52	14
53	54
54	12
55	72
56	24
57	80
58	90
59	60
60	24
61	62
62	96
63	8
64	1
65	84
66	144
67	68
68	18
69	96
70	144
71	72
72	3
73	74
74	114
75	4
76	20
77	96
78	168
79	80
80	6
81	1
82	126
83	84
84	32
85	108