A053249 - cp's OEIS frontend

A053249 Number of divisors of n such that n and n+1 have the same sum of divisors.

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

[4, 4, 8, 8, 12, 8, 8, 4, 6, 12, 10, 4, 16, 12, 8, 8, 8, 12, 16, 8, 8, 16, 16, 16, 16, 8, 16, 8, 16, 4, 16, 16, 16, 12, 24, 12, 16, 8, 16, 16, 8, 16, 16, 12, 16, 16, 16, 16, 12, 12, 12, 16, 16, 40, 16, 16, 32, 12, 24, 32, 24, 16, 16, 24, 24, 4, 24, 16, 64, 24, 16, 8, 16, 16, 16, 24, 32, 32, 20, 16]

cp's OEIS Frontend

A053249 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	4
3	8
4	8
5	12
6	8
7	8
8	4
9	6
10	12
11	10
12	4
13	16
14	12
15	8
16	8
17	8
18	12
19	16
20	8
21	8
22	16
23	16
24	16
25	16
26	8
27	16
28	8
29	16
30	4
31	16
32	16
33	16
34	12
35	24
36	12
37	16
38	8
39	16
40	16
41	8
42	16
43	16
44	12
45	16
46	16
47	16
48	16
49	12
50	12
51	12
52	16
53	16
54	40
55	16
56	16
57	32
58	12
59	24
60	32
61	24
62	16
63	16
64	24
65	24
66	4
67	24
68	16
69	64
70	24
71	16
72	8
73	16
74	16
75	16
76	24
77	32
78	32
79	20
80	16

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

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