A354453 - cp's OEIS frontend

A354453 Lexicographically earliest sequence of distinct positive integers on a square spiral such that any 2 X 2 square of numbers sums to a prime, and that prime is unique for all such squares. Start with a(1) = 0.

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	5
8	8
9	14
10	7
11	9
12	17
13	10
14	12
15	19
16	21
17	11
18	18
19	16
20	32
21	13
22	23
23	25
24	20
25	30
26	15
27	27
28	40
29	31
30	43
31	22
32	28
33	39
34	37
35	36
36	41
37	24
38	51
39	57
40	48
41	35
42	69
43	26
44	49
45	66
46	53
47	65
48	58
49	76
50	29
51	61
52	88
53	38
54	90
55	33
56	113
57	34
58	54
59	123
60	67
61	86
62	74
63	100
64	98
65	42
66	75
67	91
68	70
69	96
70	102
71	71
72	117
73	44
74	106
75	126

[0, 1, 2, 4, 3, 6, 5, 8, 14, 7, 9, 17, 10, 12, 19, 21, 11, 18, 16, 32, 13, 23, 25, 20, 30, 15, 27, 40, 31, 43, 22, 28, 39, 37, 36, 41, 24, 51, 57, 48, 35, 69, 26, 49, 66, 53, 65, 58, 76, 29, 61, 88, 38, 90, 33, 113, 34, 54, 123, 67, 86, 74, 100, 98, 42, 75, 91, 70, 96, 102, 71, 117, 44, 106, 126]

cp's OEIS Frontend

A354453 Lexicographically earliest sequence of distinct positive integers on a square spiral such that any 2 X 2 square of numbers sums to a prime, and that prime is unique for all such squares. Start with a(1) = 0.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	5
8	8
9	14
10	7
11	9
12	17
13	10
14	12
15	19
16	21
17	11
18	18
19	16
20	32
21	13
22	23
23	25
24	20
25	30
26	15
27	27
28	40
29	31
30	43
31	22
32	28
33	39
34	37
35	36
36	41
37	24
38	51
39	57
40	48
41	35
42	69
43	26
44	49
45	66
46	53
47	65
48	58
49	76
50	29
51	61
52	88
53	38
54	90
55	33
56	113
57	34
58	54
59	123
60	67
61	86
62	74
63	100
64	98
65	42
66	75
67	91
68	70
69	96
70	102
71	71
72	117
73	44
74	106
75	126

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	5
8	8
9	14
10	7
11	9
12	17
13	10
14	12
15	19
16	21
17	11
18	18
19	16
20	32
21	13
22	23
23	25
24	20
25	30
26	15
27	27
28	40
29	31
30	43
31	22
32	28
33	39
34	37
35	36
36	41
37	24
38	51
39	57
40	48
41	35
42	69
43	26
44	49
45	66
46	53
47	65
48	58
49	76
50	29
51	61
52	88
53	38
54	90
55	33
56	113
57	34
58	54
59	123
60	67
61	86
62	74
63	100
64	98
65	42
66	75
67	91
68	70
69	96
70	102
71	71
72	117
73	44
74	106
75	126

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	5
8	8
9	14
10	7
11	9
12	17
13	10
14	12
15	19
16	21
17	11
18	18
19	16
20	32
21	13
22	23
23	25
24	20
25	30
26	15
27	27
28	40
29	31
30	43
31	22
32	28
33	39
34	37
35	36
36	41
37	24
38	51
39	57
40	48
41	35
42	69
43	26
44	49
45	66
46	53
47	65
48	58
49	76
50	29
51	61
52	88
53	38
54	90
55	33
56	113
57	34
58	54
59	123
60	67
61	86
62	74
63	100
64	98
65	42
66	75
67	91
68	70
69	96
70	102
71	71
72	117
73	44
74	106
75	126