A359390 - cp's OEIS frontend

A359390 Sequence lists the numbers k such that bottom entry is an integer in the ratio d(i+1)/d(i) triangle of the elements in the divisors of n, where d(1) < d(2) < ... < d(q) denote the divisors of k.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	9
9	11
10	13
11	16
12	17
13	19
14	23
15	25
16	27
17	29
18	31
19	32
20	36
21	37
22	41
23	43
24	47
25	49
26	53
27	59
28	61
29	64
30	67
31	71
32	73
33	79
34	81
35	83
36	89
37	97
38	100
39	101
40	103
41	107
42	109
43	113
44	121
45	125
46	127
47	128
48	131
49	137
50	139
51	144
52	149
53	151
54	157
55	163
56	167
57	169
58	173
59	179
60	181
61	191
62	193

[1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 16, 17, 19, 23, 25, 27, 29, 31, 32, 36, 37, 41, 43, 47, 49, 53, 59, 61, 64, 67, 71, 73, 79, 81, 83, 89, 97, 100, 101, 103, 107, 109, 113, 121, 125, 127, 128, 131, 137, 139, 144, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193]

cp's OEIS Frontend

A359390 Sequence lists the numbers k such that bottom entry is an integer in the ratio d(i+1)/d(i) triangle of the elements in the divisors of n, where d(1) < d(2) < ... < d(q) denote the divisors of k.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	9
9	11
10	13
11	16
12	17
13	19
14	23
15	25
16	27
17	29
18	31
19	32
20	36
21	37
22	41
23	43
24	47
25	49
26	53
27	59
28	61
29	64
30	67
31	71
32	73
33	79
34	81
35	83
36	89
37	97
38	100
39	101
40	103
41	107
42	109
43	113
44	121
45	125
46	127
47	128
48	131
49	137
50	139
51	144
52	149
53	151
54	157
55	163
56	167
57	169
58	173
59	179
60	181
61	191
62	193

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	9
9	11
10	13
11	16
12	17
13	19
14	23
15	25
16	27
17	29
18	31
19	32
20	36
21	37
22	41
23	43
24	47
25	49
26	53
27	59
28	61
29	64
30	67
31	71
32	73
33	79
34	81
35	83
36	89
37	97
38	100
39	101
40	103
41	107
42	109
43	113
44	121
45	125
46	127
47	128
48	131
49	137
50	139
51	144
52	149
53	151
54	157
55	163
56	167
57	169
58	173
59	179
60	181
61	191
62	193

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	7
7	8
8	9
9	11
10	13
11	16
12	17
13	19
14	23
15	25
16	27
17	29
18	31
19	32
20	36
21	37
22	41
23	43
24	47
25	49
26	53
27	59
28	61
29	64
30	67
31	71
32	73
33	79
34	81
35	83
36	89
37	97
38	100
39	101
40	103
41	107
42	109
43	113
44	121
45	125
46	127
47	128
48	131
49	137
50	139
51	144
52	149
53	151
54	157
55	163
56	167
57	169
58	173
59	179
60	181
61	191
62	193