A068007 - cp's OEIS frontend

A068007 Least number k such that the number of primes of the form [k/j] for j=1..k (A068050) is n, or zero if impossible.

n	a(n)
0	1
1	2
2	5
3	7
4	10
5	11
6	15
7	21
8	0
9	22
10	23
11	31
12	34
13	38
14	35
15	45
16	50
17	46
18	47
19	53
20	62
21	58
22	59
23	67
24	69
25	84
26	70
27	71
28	79
29	83
30	87
31	92
32	93
33	101
34	94
35	105
36	95
37	106
38	107
39	116
40	117
41	122
42	118
43	125
44	119
45	134
46	135
47	139
48	146
49	142
50	149
51	143
52	156
53	155
54	158
55	159
56	171
57	166
58	167
59	176
60	175
61	185

[1, 2, 5, 7, 10, 11, 15, 21, 0, 22, 23, 31, 34, 38, 35, 45, 50, 46, 47, 53, 62, 58, 59, 67, 69, 84, 70, 71, 79, 83, 87, 92, 93, 101, 94, 105, 95, 106, 107, 116, 117, 122, 118, 125, 119, 134, 135, 139, 146, 142, 149, 143, 156, 155, 158, 159, 171, 166, 167, 176, 175, 185]

cp's OEIS Frontend

A068007 Least number k such that the number of primes of the form [k/j] for j=1..k (A068050) is n, or zero if impossible.

Table of values

List of values

n	a(n)
0	1
1	2
2	5
3	7
4	10
5	11
6	15
7	21
8	0
9	22
10	23
11	31
12	34
13	38
14	35
15	45
16	50
17	46
18	47
19	53
20	62
21	58
22	59
23	67
24	69
25	84
26	70
27	71
28	79
29	83
30	87
31	92
32	93
33	101
34	94
35	105
36	95
37	106
38	107
39	116
40	117
41	122
42	118
43	125
44	119
45	134
46	135
47	139
48	146
49	142
50	149
51	143
52	156
53	155
54	158
55	159
56	171
57	166
58	167
59	176
60	175
61	185

n	a(n)
0	1
1	2
2	5
3	7
4	10
5	11
6	15
7	21
8	0
9	22
10	23
11	31
12	34
13	38
14	35
15	45
16	50
17	46
18	47
19	53
20	62
21	58
22	59
23	67
24	69
25	84
26	70
27	71
28	79
29	83
30	87
31	92
32	93
33	101
34	94
35	105
36	95
37	106
38	107
39	116
40	117
41	122
42	118
43	125
44	119
45	134
46	135
47	139
48	146
49	142
50	149
51	143
52	156
53	155
54	158
55	159
56	171
57	166
58	167
59	176
60	175
61	185

n	a(n)
0	1
1	2
2	5
3	7
4	10
5	11
6	15
7	21
8	0
9	22
10	23
11	31
12	34
13	38
14	35
15	45
16	50
17	46
18	47
19	53
20	62
21	58
22	59
23	67
24	69
25	84
26	70
27	71
28	79
29	83
30	87
31	92
32	93
33	101
34	94
35	105
36	95
37	106
38	107
39	116
40	117
41	122
42	118
43	125
44	119
45	134
46	135
47	139
48	146
49	142
50	149
51	143
52	156
53	155
54	158
55	159
56	171
57	166
58	167
59	176
60	175
61	185