A158975 - cp's OEIS frontend

A158975 a(n) = sum of numbers k <= n such that all proper divisors of k are divisors of n.

n	a(n)
1	1
2	3
3	6
4	10
5	11
6	21
7	18
8	30
9	27
10	32
11	29
12	68
13	42
14	60
15	66
16	70
17	59
18	96
19	78
20	120
21	108
22	104
23	101
24	180
25	126
26	131
27	137
28	155
29	130
30	229
31	161
32	221
33	203
34	199
35	221
36	281
37	198
38	240
39	246
40	321
41	239
42	335
43	282
44	360
45	403
46	332
47	329
48	488
49	378
50	418
51	389
52	419
53	382
54	500
55	462
56	557
57	448

[1, 3, 6, 10, 11, 21, 18, 30, 27, 32, 29, 68, 42, 60, 66, 70, 59, 96, 78, 120, 108, 104, 101, 180, 126, 131, 137, 155, 130, 229, 161, 221, 203, 199, 221, 281, 198, 240, 246, 321, 239, 335, 282, 360, 403, 332, 329, 488, 378, 418, 389, 419, 382, 500, 462, 557, 448]

cp's OEIS Frontend

A158975 a(n) = sum of numbers k <= n such that all proper divisors of k are divisors of n.

Table of values

List of values

n	a(n)
1	1
2	3
3	6
4	10
5	11
6	21
7	18
8	30
9	27
10	32
11	29
12	68
13	42
14	60
15	66
16	70
17	59
18	96
19	78
20	120
21	108
22	104
23	101
24	180
25	126
26	131
27	137
28	155
29	130
30	229
31	161
32	221
33	203
34	199
35	221
36	281
37	198
38	240
39	246
40	321
41	239
42	335
43	282
44	360
45	403
46	332
47	329
48	488
49	378
50	418
51	389
52	419
53	382
54	500
55	462
56	557
57	448

n	a(n)
1	1
2	3
3	6
4	10
5	11
6	21
7	18
8	30
9	27
10	32
11	29
12	68
13	42
14	60
15	66
16	70
17	59
18	96
19	78
20	120
21	108
22	104
23	101
24	180
25	126
26	131
27	137
28	155
29	130
30	229
31	161
32	221
33	203
34	199
35	221
36	281
37	198
38	240
39	246
40	321
41	239
42	335
43	282
44	360
45	403
46	332
47	329
48	488
49	378
50	418
51	389
52	419
53	382
54	500
55	462
56	557
57	448

n	a(n)
1	1
2	3
3	6
4	10
5	11
6	21
7	18
8	30
9	27
10	32
11	29
12	68
13	42
14	60
15	66
16	70
17	59
18	96
19	78
20	120
21	108
22	104
23	101
24	180
25	126
26	131
27	137
28	155
29	130
30	229
31	161
32	221
33	203
34	199
35	221
36	281
37	198
38	240
39	246
40	321
41	239
42	335
43	282
44	360
45	403
46	332
47	329
48	488
49	378
50	418
51	389
52	419
53	382
54	500
55	462
56	557
57	448