A354441 - cp's OEIS frontend

A354441 Lexicographically earliest sequence of distinct positive integers on a square spiral such that any 3X3 square of numbers sums to a prime.

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

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

cp's OEIS Frontend

A354441 Lexicographically earliest sequence of distinct positive integers on a square spiral such that any 3X3 square of numbers sums to a prime.

Table of values

List of values

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

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

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