A378994 - cp's OEIS frontend

A378994 a(n) = gcd(2n, sigma(2n)).

n	a(n)
1	1
2	1
3	6
4	1
5	2
6	4
7	2
8	1
9	3
10	2
11	2
12	12
13	2
14	28
15	6
16	1
17	2
18	1
19	2
20	10
21	6
22	4
23	2
24	4
25	1
26	2
27	6
28	8
29	2
30	12
31	2
32	1
33	6
34	2
35	2
36	3
37	2
38	4
39	6
40	2
41	2
42	28
43	2
44	4
45	18
46	4
47	2
48	12
49	1
50	1
51	6
52	2
53	2
54	4
55	2
56	8
57	6
58	2
59	2
60	120
61	2
62	4
63	6
64	1
65	2
66	12
67	2
68	2
69	6
70	28
71	2
72	1
73	2
74	2
75	6
76	4
77	2
78	4
79	2
80	2
81	3
82	2
83	2
84	24
85	2
86	4
87	6
88	4
89	2
90	6
91	14
92	8
93	6
94	4
95	10
96	4
97	2
98	7
99	18
100	5

[1, 1, 6, 1, 2, 4, 2, 1, 3, 2, 2, 12, 2, 28, 6, 1, 2, 1, 2, 10, 6, 4, 2, 4, 1, 2, 6, 8, 2, 12, 2, 1, 6, 2, 2, 3, 2, 4, 6, 2, 2, 28, 2, 4, 18, 4, 2, 12, 1, 1, 6, 2, 2, 4, 2, 8, 6, 2, 2, 120, 2, 4, 6, 1, 2, 12, 2, 2, 6, 28, 2, 1, 2, 2, 6, 4, 2, 4, 2, 2, 3, 2, 2, 24, 2, 4, 6, 4, 2, 6, 14, 8, 6, 4, 10, 4, 2, 7, 18, 5]

cp's OEIS Frontend

A378994 a(n) = gcd(2n, sigma(2n)).

Table of values

List of values

n	a(n)
1	1
2	1
3	6
4	1
5	2
6	4
7	2
8	1
9	3
10	2
11	2
12	12
13	2
14	28
15	6
16	1
17	2
18	1
19	2
20	10
21	6
22	4
23	2
24	4
25	1
26	2
27	6
28	8
29	2
30	12
31	2
32	1
33	6
34	2
35	2
36	3
37	2
38	4
39	6
40	2
41	2
42	28
43	2
44	4
45	18
46	4
47	2
48	12
49	1
50	1
51	6
52	2
53	2
54	4
55	2
56	8
57	6
58	2
59	2
60	120
61	2
62	4
63	6
64	1
65	2
66	12
67	2
68	2
69	6
70	28
71	2
72	1
73	2
74	2
75	6
76	4
77	2
78	4
79	2
80	2
81	3
82	2
83	2
84	24
85	2
86	4
87	6
88	4
89	2
90	6
91	14
92	8
93	6
94	4
95	10
96	4
97	2
98	7
99	18
100	5

n	a(n)
1	1
2	1
3	6
4	1
5	2
6	4
7	2
8	1
9	3
10	2
11	2
12	12
13	2
14	28
15	6
16	1
17	2
18	1
19	2
20	10
21	6
22	4
23	2
24	4
25	1
26	2
27	6
28	8
29	2
30	12
31	2
32	1
33	6
34	2
35	2
36	3
37	2
38	4
39	6
40	2
41	2
42	28
43	2
44	4
45	18
46	4
47	2
48	12
49	1
50	1
51	6
52	2
53	2
54	4
55	2
56	8
57	6
58	2
59	2
60	120
61	2
62	4
63	6
64	1
65	2
66	12
67	2
68	2
69	6
70	28
71	2
72	1
73	2
74	2
75	6
76	4
77	2
78	4
79	2
80	2
81	3
82	2
83	2
84	24
85	2
86	4
87	6
88	4
89	2
90	6
91	14
92	8
93	6
94	4
95	10
96	4
97	2
98	7
99	18
100	5

cp's OEIS Frontend

A378994 a(n) = gcd(2*n, sigma(2*n)).

Table of values

List of values

A378994 a(n) = gcd(2n, sigma(2n)).

n	a(n)
1	1
2	1
3	6
4	1
5	2
6	4
7	2
8	1
9	3
10	2
11	2
12	12
13	2
14	28
15	6
16	1
17	2
18	1
19	2
20	10
21	6
22	4
23	2
24	4
25	1
26	2
27	6
28	8
29	2
30	12
31	2
32	1
33	6
34	2
35	2
36	3
37	2
38	4
39	6
40	2
41	2
42	28
43	2
44	4
45	18
46	4
47	2
48	12
49	1
50	1
51	6
52	2
53	2
54	4
55	2
56	8
57	6
58	2
59	2
60	120
61	2
62	4
63	6
64	1
65	2
66	12
67	2
68	2
69	6
70	28
71	2
72	1
73	2
74	2
75	6
76	4
77	2
78	4
79	2
80	2
81	3
82	2
83	2
84	24
85	2
86	4
87	6
88	4
89	2
90	6
91	14
92	8
93	6
94	4
95	10
96	4
97	2
98	7
99	18
100	5