A064663 - cp's OEIS frontend

A064663 a(n) = n - ceiling( prime(n)/log(prime(n)) ).

n	a(n)
1	-2
2	-1
3	-1
4	0
5	0
6	0
7	0
8	1
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	3
19	3
20	3
21	3
22	3
23	4
24	4
25	3
26	4
27	4
28	5
29	5
30	6
31	4
32	5
33	5
34	5
35	5
36	5
37	5
38	6
39	6
40	6
41	6
42	7
43	6
44	7
45	7
46	8
47	7
48	6
49	7
50	7
51	8
52	8
53	9
54	8
55	8
56	8
57	8
58	9
59	9
60	10
61	10
62	10
63	9
64	9
65	10
66	10
67	9
68	10
69	9
70	10
71	10
72	10
73	10
74	11
75	11
76	11
77	11
78	11
79	12
80	11
81	11
82	12
83	11

[-2, -1, -1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 3, 4, 4, 5, 5, 6, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7, 6, 7, 7, 8, 7, 6, 7, 7, 8, 8, 9, 8, 8, 8, 8, 9, 9, 10, 10, 10, 9, 9, 10, 10, 9, 10, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 11, 11, 12, 11]

cp's OEIS Frontend

A064663 a(n) = n - ceiling( prime(n)/log(prime(n)) ).

Table of values

List of values

n	a(n)
1	-2
2	-1
3	-1
4	0
5	0
6	0
7	0
8	1
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	3
19	3
20	3
21	3
22	3
23	4
24	4
25	3
26	4
27	4
28	5
29	5
30	6
31	4
32	5
33	5
34	5
35	5
36	5
37	5
38	6
39	6
40	6
41	6
42	7
43	6
44	7
45	7
46	8
47	7
48	6
49	7
50	7
51	8
52	8
53	9
54	8
55	8
56	8
57	8
58	9
59	9
60	10
61	10
62	10
63	9
64	9
65	10
66	10
67	9
68	10
69	9
70	10
71	10
72	10
73	10
74	11
75	11
76	11
77	11
78	11
79	12
80	11
81	11
82	12
83	11

n	a(n)
1	-2
2	-1
3	-1
4	0
5	0
6	0
7	0
8	1
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	3
19	3
20	3
21	3
22	3
23	4
24	4
25	3
26	4
27	4
28	5
29	5
30	6
31	4
32	5
33	5
34	5
35	5
36	5
37	5
38	6
39	6
40	6
41	6
42	7
43	6
44	7
45	7
46	8
47	7
48	6
49	7
50	7
51	8
52	8
53	9
54	8
55	8
56	8
57	8
58	9
59	9
60	10
61	10
62	10
63	9
64	9
65	10
66	10
67	9
68	10
69	9
70	10
71	10
72	10
73	10
74	11
75	11
76	11
77	11
78	11
79	12
80	11
81	11
82	12
83	11

n	a(n)
1	-2
2	-1
3	-1
4	0
5	0
6	0
7	0
8	1
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	2
17	2
18	3
19	3
20	3
21	3
22	3
23	4
24	4
25	3
26	4
27	4
28	5
29	5
30	6
31	4
32	5
33	5
34	5
35	5
36	5
37	5
38	6
39	6
40	6
41	6
42	7
43	6
44	7
45	7
46	8
47	7
48	6
49	7
50	7
51	8
52	8
53	9
54	8
55	8
56	8
57	8
58	9
59	9
60	10
61	10
62	10
63	9
64	9
65	10
66	10
67	9
68	10
69	9
70	10
71	10
72	10
73	10
74	11
75	11
76	11
77	11
78	11
79	12
80	11
81	11
82	12
83	11