A163926 - cp's OEIS frontend

A163926 Number of nonprime numbers k such that the largest divisor of nk <= sqrt(nk) is n.

n	a(n)
1	1
2	1
3	3
4	3
5	6
6	4
7	10
8	6
9	8
10	7
11	16
12	6
13	22
14	12
15	11
16	9
17	30
18	9
19	38
20	11
21	17
22	18
23	48
24	11
25	26
26	24
27	20
28	14
29	61
30	13
31	72
32	18
33	28
34	32
35	29
36	13
37	87
38	40
39	33
40	18
41	101
42	17
43	115
44	25
45	26
46	50
47	131
48	19
49	59
50	29
51	44
52	29
53	151
54	23
55	47
56	24
57	52
58	63
59	171
60	20
61	189
62	75
63	40
64	32
65	55
66	27
67	211
68	42
69	66
70	31
71	232

[1, 1, 3, 3, 6, 4, 10, 6, 8, 7, 16, 6, 22, 12, 11, 9, 30, 9, 38, 11, 17, 18, 48, 11, 26, 24, 20, 14, 61, 13, 72, 18, 28, 32, 29, 13, 87, 40, 33, 18, 101, 17, 115, 25, 26, 50, 131, 19, 59, 29, 44, 29, 151, 23, 47, 24, 52, 63, 171, 20, 189, 75, 40, 32, 55, 27, 211, 42, 66, 31, 232]

cp's OEIS Frontend

A163926 Number of nonprime numbers k such that the largest divisor of nk <= sqrt(nk) is n.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	3
5	6
6	4
7	10
8	6
9	8
10	7
11	16
12	6
13	22
14	12
15	11
16	9
17	30
18	9
19	38
20	11
21	17
22	18
23	48
24	11
25	26
26	24
27	20
28	14
29	61
30	13
31	72
32	18
33	28
34	32
35	29
36	13
37	87
38	40
39	33
40	18
41	101
42	17
43	115
44	25
45	26
46	50
47	131
48	19
49	59
50	29
51	44
52	29
53	151
54	23
55	47
56	24
57	52
58	63
59	171
60	20
61	189
62	75
63	40
64	32
65	55
66	27
67	211
68	42
69	66
70	31
71	232

n	a(n)
1	1
2	1
3	3
4	3
5	6
6	4
7	10
8	6
9	8
10	7
11	16
12	6
13	22
14	12
15	11
16	9
17	30
18	9
19	38
20	11
21	17
22	18
23	48
24	11
25	26
26	24
27	20
28	14
29	61
30	13
31	72
32	18
33	28
34	32
35	29
36	13
37	87
38	40
39	33
40	18
41	101
42	17
43	115
44	25
45	26
46	50
47	131
48	19
49	59
50	29
51	44
52	29
53	151
54	23
55	47
56	24
57	52
58	63
59	171
60	20
61	189
62	75
63	40
64	32
65	55
66	27
67	211
68	42
69	66
70	31
71	232

cp's OEIS Frontend

A163926 Number of nonprime numbers k such that the largest divisor of n*k <= sqrt(n*k) is n.

Table of values

List of values

A163926 Number of nonprime numbers k such that the largest divisor of nk <= sqrt(nk) is n.

n	a(n)
1	1
2	1
3	3
4	3
5	6
6	4
7	10
8	6
9	8
10	7
11	16
12	6
13	22
14	12
15	11
16	9
17	30
18	9
19	38
20	11
21	17
22	18
23	48
24	11
25	26
26	24
27	20
28	14
29	61
30	13
31	72
32	18
33	28
34	32
35	29
36	13
37	87
38	40
39	33
40	18
41	101
42	17
43	115
44	25
45	26
46	50
47	131
48	19
49	59
50	29
51	44
52	29
53	151
54	23
55	47
56	24
57	52
58	63
59	171
60	20
61	189
62	75
63	40
64	32
65	55
66	27
67	211
68	42
69	66
70	31
71	232