A344660 - cp's OEIS frontend

A344660 Lexicographically earliest sequence of distinct nonnegative terms on a square spiral such that each term, when written with one digit per square, forms no prime value in the eight sums when each digit is added to each of its eight nearest neighbors.

n	a(n)
1	0
2	1
3	8
4	80
5	4
6	6
7	88
8	7
9	77
10	2
11	24
12	40
13	44
14	22
15	26
16	27
17	3
18	5
19	9
20	72
21	28
22	42
23	46
24	48
25	62
26	64
27	66
28	68
29	87
30	13
31	31
32	37
33	78
34	82
35	84
36	86
37	60
38	400
39	422
40	222
41	63
42	601
43	73
44	33
45	15
46	35
47	17
48	10
49	18
50	224
51	226
52	404
53	406
54	424
55	227
56	286
57	36
58	99
59	39
60	19
61	53
62	55
63	57
64	59
65	90
66	93
67	772
68	228
69	240
70	408
71	440
72	426

[0, 1, 8, 80, 4, 6, 88, 7, 77, 2, 24, 40, 44, 22, 26, 27, 3, 5, 9, 72, 28, 42, 46, 48, 62, 64, 66, 68, 87, 13, 31, 37, 78, 82, 84, 86, 60, 400, 422, 222, 63, 601, 73, 33, 15, 35, 17, 10, 18, 224, 226, 404, 406, 424, 227, 286, 36, 99, 39, 19, 53, 55, 57, 59, 90, 93, 772, 228, 240, 408, 440, 426]

cp's OEIS Frontend

A344660 Lexicographically earliest sequence of distinct nonnegative terms on a square spiral such that each term, when written with one digit per square, forms no prime value in the eight sums when each digit is added to each of its eight nearest neighbors.

Table of values

List of values

n	a(n)
1	0
2	1
3	8
4	80
5	4
6	6
7	88
8	7
9	77
10	2
11	24
12	40
13	44
14	22
15	26
16	27
17	3
18	5
19	9
20	72
21	28
22	42
23	46
24	48
25	62
26	64
27	66
28	68
29	87
30	13
31	31
32	37
33	78
34	82
35	84
36	86
37	60
38	400
39	422
40	222
41	63
42	601
43	73
44	33
45	15
46	35
47	17
48	10
49	18
50	224
51	226
52	404
53	406
54	424
55	227
56	286
57	36
58	99
59	39
60	19
61	53
62	55
63	57
64	59
65	90
66	93
67	772
68	228
69	240
70	408
71	440
72	426

n	a(n)
1	0
2	1
3	8
4	80
5	4
6	6
7	88
8	7
9	77
10	2
11	24
12	40
13	44
14	22
15	26
16	27
17	3
18	5
19	9
20	72
21	28
22	42
23	46
24	48
25	62
26	64
27	66
28	68
29	87
30	13
31	31
32	37
33	78
34	82
35	84
36	86
37	60
38	400
39	422
40	222
41	63
42	601
43	73
44	33
45	15
46	35
47	17
48	10
49	18
50	224
51	226
52	404
53	406
54	424
55	227
56	286
57	36
58	99
59	39
60	19
61	53
62	55
63	57
64	59
65	90
66	93
67	772
68	228
69	240
70	408
71	440
72	426

n	a(n)
1	0
2	1
3	8
4	80
5	4
6	6
7	88
8	7
9	77
10	2
11	24
12	40
13	44
14	22
15	26
16	27
17	3
18	5
19	9
20	72
21	28
22	42
23	46
24	48
25	62
26	64
27	66
28	68
29	87
30	13
31	31
32	37
33	78
34	82
35	84
36	86
37	60
38	400
39	422
40	222
41	63
42	601
43	73
44	33
45	15
46	35
47	17
48	10
49	18
50	224
51	226
52	404
53	406
54	424
55	227
56	286
57	36
58	99
59	39
60	19
61	53
62	55
63	57
64	59
65	90
66	93
67	772
68	228
69	240
70	408
71	440
72	426