A180253 - cp's OEIS frontend

A180253 Call two divisors of n adjacent if the larger is a prime times the smaller. a(n) is the sum of elements of all pairs of adjacent divisors of n.

n	a(n)
1	0
2	3
3	4
4	9
5	6
6	24
7	8
8	21
9	16
10	36
11	12
12	64
13	14
14	48
15	48
16	45
17	18
18	87
19	20
20	96
21	64
22	72
23	24
24	144
25	36
26	84
27	52
28	128
29	30
30	216
31	32
32	93
33	96
34	108
35	96
36	229
37	38
38	120
39	112
40	216
41	42
42	288
43	44
44	192
45	174
46	144
47	48
48	304
49	64
50	201
51	144
52	224
53	54
54	276
55	144
56	288
57	160
58	180
59	60
60	552
61	62
62	192
63	232
64	189

[0, 3, 4, 9, 6, 24, 8, 21, 16, 36, 12, 64, 14, 48, 48, 45, 18, 87, 20, 96, 64, 72, 24, 144, 36, 84, 52, 128, 30, 216, 32, 93, 96, 108, 96, 229, 38, 120, 112, 216, 42, 288, 44, 192, 174, 144, 48, 304, 64, 201, 144, 224, 54, 276, 144, 288, 160, 180, 60, 552, 62, 192, 232, 189]

cp's OEIS Frontend

A180253 Call two divisors of n adjacent if the larger is a prime times the smaller. a(n) is the sum of elements of all pairs of adjacent divisors of n.

Table of values

List of values

n	a(n)
1	0
2	3
3	4
4	9
5	6
6	24
7	8
8	21
9	16
10	36
11	12
12	64
13	14
14	48
15	48
16	45
17	18
18	87
19	20
20	96
21	64
22	72
23	24
24	144
25	36
26	84
27	52
28	128
29	30
30	216
31	32
32	93
33	96
34	108
35	96
36	229
37	38
38	120
39	112
40	216
41	42
42	288
43	44
44	192
45	174
46	144
47	48
48	304
49	64
50	201
51	144
52	224
53	54
54	276
55	144
56	288
57	160
58	180
59	60
60	552
61	62
62	192
63	232
64	189

n	a(n)
1	0
2	3
3	4
4	9
5	6
6	24
7	8
8	21
9	16
10	36
11	12
12	64
13	14
14	48
15	48
16	45
17	18
18	87
19	20
20	96
21	64
22	72
23	24
24	144
25	36
26	84
27	52
28	128
29	30
30	216
31	32
32	93
33	96
34	108
35	96
36	229
37	38
38	120
39	112
40	216
41	42
42	288
43	44
44	192
45	174
46	144
47	48
48	304
49	64
50	201
51	144
52	224
53	54
54	276
55	144
56	288
57	160
58	180
59	60
60	552
61	62
62	192
63	232
64	189

n	a(n)
1	0
2	3
3	4
4	9
5	6
6	24
7	8
8	21
9	16
10	36
11	12
12	64
13	14
14	48
15	48
16	45
17	18
18	87
19	20
20	96
21	64
22	72
23	24
24	144
25	36
26	84
27	52
28	128
29	30
30	216
31	32
32	93
33	96
34	108
35	96
36	229
37	38
38	120
39	112
40	216
41	42
42	288
43	44
44	192
45	174
46	144
47	48
48	304
49	64
50	201
51	144
52	224
53	54
54	276
55	144
56	288
57	160
58	180
59	60
60	552
61	62
62	192
63	232
64	189