A064658 - cp's OEIS frontend

A064658 a(n) = ceiling(prime(n) - n*log(n)).

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

[2, 2, 2, 2, 3, 3, 4, 3, 4, 6, 5, 8, 8, 7, 7, 9, 11, 9, 12, 12, 10, 11, 11, 13, 17, 17, 15, 14, 12, 11, 21, 21, 22, 20, 25, 22, 24, 25, 25, 26, 27, 25, 30, 27, 26, 23, 31, 38, 37, 34, 33, 34, 31, 36, 37, 38, 39, 36, 37, 36, 33, 38, 46, 45, 42, 41, 50, 51, 55]

cp's OEIS Frontend

A064658 a(n) = ceiling(prime(n) - n*log(n)).

Table of values

List of values

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

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

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