A338644 - cp's OEIS frontend

A338644 Square spiral of smallest distinct positive integers starting at 1 such that the four sums of each term with its four nearest neighbors is a prime number.

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	12
9	11
10	8
11	9
12	10
13	13
14	16
15	15
16	22
17	19
18	24
19	17
20	14
21	23
22	18
23	25
24	36
25	35
26	26
27	21
28	20
29	27
30	34
31	33
32	28
33	31
34	52
35	37
36	42
37	29
38	54
39	43
40	30
41	53
42	44
43	39
44	50
45	89
46	48
47	61
48	66
49	41
50	32
51	47
52	62
53	51
54	46
55	55
56	76
57	63
58	38
59	45
60	58
61	49
62	60
63	67
64	72
65	59
66	68
67	83
68	84
69	73
70	78
71	95
72	98
73	65
74	74
75	57
76	92

[1, 2, 3, 4, 7, 6, 5, 12, 11, 8, 9, 10, 13, 16, 15, 22, 19, 24, 17, 14, 23, 18, 25, 36, 35, 26, 21, 20, 27, 34, 33, 28, 31, 52, 37, 42, 29, 54, 43, 30, 53, 44, 39, 50, 89, 48, 61, 66, 41, 32, 47, 62, 51, 46, 55, 76, 63, 38, 45, 58, 49, 60, 67, 72, 59, 68, 83, 84, 73, 78, 95, 98, 65, 74, 57, 92]

cp's OEIS Frontend

A338644 Square spiral of smallest distinct positive integers starting at 1 such that the four sums of each term with its four nearest neighbors is a prime number.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	12
9	11
10	8
11	9
12	10
13	13
14	16
15	15
16	22
17	19
18	24
19	17
20	14
21	23
22	18
23	25
24	36
25	35
26	26
27	21
28	20
29	27
30	34
31	33
32	28
33	31
34	52
35	37
36	42
37	29
38	54
39	43
40	30
41	53
42	44
43	39
44	50
45	89
46	48
47	61
48	66
49	41
50	32
51	47
52	62
53	51
54	46
55	55
56	76
57	63
58	38
59	45
60	58
61	49
62	60
63	67
64	72
65	59
66	68
67	83
68	84
69	73
70	78
71	95
72	98
73	65
74	74
75	57
76	92

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	12
9	11
10	8
11	9
12	10
13	13
14	16
15	15
16	22
17	19
18	24
19	17
20	14
21	23
22	18
23	25
24	36
25	35
26	26
27	21
28	20
29	27
30	34
31	33
32	28
33	31
34	52
35	37
36	42
37	29
38	54
39	43
40	30
41	53
42	44
43	39
44	50
45	89
46	48
47	61
48	66
49	41
50	32
51	47
52	62
53	51
54	46
55	55
56	76
57	63
58	38
59	45
60	58
61	49
62	60
63	67
64	72
65	59
66	68
67	83
68	84
69	73
70	78
71	95
72	98
73	65
74	74
75	57
76	92

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	6
7	5
8	12
9	11
10	8
11	9
12	10
13	13
14	16
15	15
16	22
17	19
18	24
19	17
20	14
21	23
22	18
23	25
24	36
25	35
26	26
27	21
28	20
29	27
30	34
31	33
32	28
33	31
34	52
35	37
36	42
37	29
38	54
39	43
40	30
41	53
42	44
43	39
44	50
45	89
46	48
47	61
48	66
49	41
50	32
51	47
52	62
53	51
54	46
55	55
56	76
57	63
58	38
59	45
60	58
61	49
62	60
63	67
64	72
65	59
66	68
67	83
68	84
69	73
70	78
71	95
72	98
73	65
74	74
75	57
76	92