A054002 - cp's OEIS frontend

A054002 Number of divisors of n such that n and n-1 have the same sum of divisors.

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

[4, 6, 4, 8, 16, 8, 8, 12, 12, 8, 4, 10, 8, 4, 8, 12, 8, 16, 16, 16, 16, 8, 16, 12, 16, 16, 8, 8, 4, 16, 8, 24, 16, 4, 16, 8, 4, 32, 8, 16, 16, 16, 8, 8, 8, 8, 16, 32, 8, 8, 16, 16, 16, 12, 16, 16, 12, 8, 48, 32, 8, 24, 24, 16, 16, 16, 8, 16, 24, 64, 8, 16, 16, 16, 16, 64, 24, 32, 60]

cp's OEIS Frontend

A054002 Number of divisors of n such that n and n-1 have the same sum of divisors.

Table of values

List of values

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

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

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