A324121 - cp's OEIS frontend

A324121 a(n) = gcd(n*d(n), sigma(n)), where d(n) = number of divisors of n (A000005) and sigma(n) = sum of divisors of n (A000203).

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	12
7	2
8	1
9	1
10	2
11	2
12	4
13	2
14	8
15	12
16	1
17	2
18	3
19	2
20	6
21	4
22	4
23	2
24	12
25	1
26	2
27	4
28	56
29	2
30	24
31	2
32	3
33	12
34	2
35	4
36	1
37	2
38	4
39	4
40	10
41	2
42	48
43	2
44	12
45	6
46	8
47	2
48	4
49	3
50	3
51	12
52	2
53	2
54	24
55	4
56	8
57	4
58	2
59	2
60	24
61	2
62	8
63	2
64	1
65	4
66	48
67	2
68	6
69	12
70	16
71	2
72	3
73	2
74	2
75	2
76	4
77	4
78	24
79	2
80	2
81	1
82	2
83	2
84	112
85	4
86	4
87	12
88	4
89	2
90	18
91	28
92	24
93	4
94	8
95	20
96	36
97	2
98	3
99	6
100	1
101	2
102	24
103	2
104	2
105	24

[1, 1, 2, 1, 2, 12, 2, 1, 1, 2, 2, 4, 2, 8, 12, 1, 2, 3, 2, 6, 4, 4, 2, 12, 1, 2, 4, 56, 2, 24, 2, 3, 12, 2, 4, 1, 2, 4, 4, 10, 2, 48, 2, 12, 6, 8, 2, 4, 3, 3, 12, 2, 2, 24, 4, 8, 4, 2, 2, 24, 2, 8, 2, 1, 4, 48, 2, 6, 12, 16, 2, 3, 2, 2, 2, 4, 4, 24, 2, 2, 1, 2, 2, 112, 4, 4, 12, 4, 2, 18, 28, 24, 4, 8, 20, 36, 2, 3, 6, 1, 2, 24, 2, 2, 24]

cp's OEIS Frontend

A324121 a(n) = gcd(n*d(n), sigma(n)), where d(n) = number of divisors of n (A000005) and sigma(n) = sum of divisors of n (A000203).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	12
7	2
8	1
9	1
10	2
11	2
12	4
13	2
14	8
15	12
16	1
17	2
18	3
19	2
20	6
21	4
22	4
23	2
24	12
25	1
26	2
27	4
28	56
29	2
30	24
31	2
32	3
33	12
34	2
35	4
36	1
37	2
38	4
39	4
40	10
41	2
42	48
43	2
44	12
45	6
46	8
47	2
48	4
49	3
50	3
51	12
52	2
53	2
54	24
55	4
56	8
57	4
58	2
59	2
60	24
61	2
62	8
63	2
64	1
65	4
66	48
67	2
68	6
69	12
70	16
71	2
72	3
73	2
74	2
75	2
76	4
77	4
78	24
79	2
80	2
81	1
82	2
83	2
84	112
85	4
86	4
87	12
88	4
89	2
90	18
91	28
92	24
93	4
94	8
95	20
96	36
97	2
98	3
99	6
100	1
101	2
102	24
103	2
104	2
105	24

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	12
7	2
8	1
9	1
10	2
11	2
12	4
13	2
14	8
15	12
16	1
17	2
18	3
19	2
20	6
21	4
22	4
23	2
24	12
25	1
26	2
27	4
28	56
29	2
30	24
31	2
32	3
33	12
34	2
35	4
36	1
37	2
38	4
39	4
40	10
41	2
42	48
43	2
44	12
45	6
46	8
47	2
48	4
49	3
50	3
51	12
52	2
53	2
54	24
55	4
56	8
57	4
58	2
59	2
60	24
61	2
62	8
63	2
64	1
65	4
66	48
67	2
68	6
69	12
70	16
71	2
72	3
73	2
74	2
75	2
76	4
77	4
78	24
79	2
80	2
81	1
82	2
83	2
84	112
85	4
86	4
87	12
88	4
89	2
90	18
91	28
92	24
93	4
94	8
95	20
96	36
97	2
98	3
99	6
100	1
101	2
102	24
103	2
104	2
105	24

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	12
7	2
8	1
9	1
10	2
11	2
12	4
13	2
14	8
15	12
16	1
17	2
18	3
19	2
20	6
21	4
22	4
23	2
24	12
25	1
26	2
27	4
28	56
29	2
30	24
31	2
32	3
33	12
34	2
35	4
36	1
37	2
38	4
39	4
40	10
41	2
42	48
43	2
44	12
45	6
46	8
47	2
48	4
49	3
50	3
51	12
52	2
53	2
54	24
55	4
56	8
57	4
58	2
59	2
60	24
61	2
62	8
63	2
64	1
65	4
66	48
67	2
68	6
69	12
70	16
71	2
72	3
73	2
74	2
75	2
76	4
77	4
78	24
79	2
80	2
81	1
82	2
83	2
84	112
85	4
86	4
87	12
88	4
89	2
90	18
91	28
92	24
93	4
94	8
95	20
96	36
97	2
98	3
99	6
100	1
101	2
102	24
103	2
104	2
105	24