A344316 - cp's OEIS frontend

A344316 Number of primes appearing along the border of an n X n square array whose elements are the numbers from 1..n^2, listed in increasing order by rows.

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

[0, 2, 3, 4, 5, 7, 7, 8, 8, 10, 9, 13, 12, 13, 12, 12, 13, 20, 14, 17, 17, 19, 16, 22, 18, 22, 19, 23, 19, 31, 18, 26, 24, 26, 25, 31, 18, 27, 28, 30, 22, 39, 25, 30, 31, 37, 26, 41, 29, 37, 32, 42, 28, 44, 31, 39, 30, 41, 32, 51, 33, 39, 40, 41, 36, 52, 35, 44, 39, 50, 39, 52, 39]

cp's OEIS Frontend

A344316 Number of primes appearing along the border of an n X n square array whose elements are the numbers from 1..n^2, listed in increasing order by rows.

Table of values

List of values

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

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

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