A000006 - cp's OEIS frontend

A000006 Integer part of square root of n-th prime.

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

[1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18]

cp's OEIS Frontend

A000006 Integer part of square root of n-th prime.

Table of values

List of values

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

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

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