A358021 - cp's OEIS frontend

A358021 Lexicographically earliest sequence of distinct nonnegative integers on a square spiral such that no number shares a digit with any of its eight surrounding neighbors.

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	30
11	44
12	10
13	55
14	11
15	20
16	13
17	66
18	12
19	33
20	14
21	22
22	15
23	23
24	16
25	24
26	57
27	18
28	25
29	36
30	27
31	48
32	26
33	34
34	56
35	47
36	28
37	50
38	49
39	58
40	60
41	29
42	35
43	67
44	38
45	40
46	77
47	59
48	37
49	19
50	68
51	39
52	46
53	70
54	41
55	80
56	31
57	65
58	90
59	17
60	88
61	21
62	93
63	51
64	43
65	69
66	71
67	32
68	111
69	73
70	81
71	64
72	72
73	89
74	42
75	91

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 30, 44, 10, 55, 11, 20, 13, 66, 12, 33, 14, 22, 15, 23, 16, 24, 57, 18, 25, 36, 27, 48, 26, 34, 56, 47, 28, 50, 49, 58, 60, 29, 35, 67, 38, 40, 77, 59, 37, 19, 68, 39, 46, 70, 41, 80, 31, 65, 90, 17, 88, 21, 93, 51, 43, 69, 71, 32, 111, 73, 81, 64, 72, 89, 42, 91]

cp's OEIS Frontend

A358021 Lexicographically earliest sequence of distinct nonnegative integers on a square spiral such that no number shares a digit with any of its eight surrounding neighbors.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	30
11	44
12	10
13	55
14	11
15	20
16	13
17	66
18	12
19	33
20	14
21	22
22	15
23	23
24	16
25	24
26	57
27	18
28	25
29	36
30	27
31	48
32	26
33	34
34	56
35	47
36	28
37	50
38	49
39	58
40	60
41	29
42	35
43	67
44	38
45	40
46	77
47	59
48	37
49	19
50	68
51	39
52	46
53	70
54	41
55	80
56	31
57	65
58	90
59	17
60	88
61	21
62	93
63	51
64	43
65	69
66	71
67	32
68	111
69	73
70	81
71	64
72	72
73	89
74	42
75	91

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	30
11	44
12	10
13	55
14	11
15	20
16	13
17	66
18	12
19	33
20	14
21	22
22	15
23	23
24	16
25	24
26	57
27	18
28	25
29	36
30	27
31	48
32	26
33	34
34	56
35	47
36	28
37	50
38	49
39	58
40	60
41	29
42	35
43	67
44	38
45	40
46	77
47	59
48	37
49	19
50	68
51	39
52	46
53	70
54	41
55	80
56	31
57	65
58	90
59	17
60	88
61	21
62	93
63	51
64	43
65	69
66	71
67	32
68	111
69	73
70	81
71	64
72	72
73	89
74	42
75	91

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	30
11	44
12	10
13	55
14	11
15	20
16	13
17	66
18	12
19	33
20	14
21	22
22	15
23	23
24	16
25	24
26	57
27	18
28	25
29	36
30	27
31	48
32	26
33	34
34	56
35	47
36	28
37	50
38	49
39	58
40	60
41	29
42	35
43	67
44	38
45	40
46	77
47	59
48	37
49	19
50	68
51	39
52	46
53	70
54	41
55	80
56	31
57	65
58	90
59	17
60	88
61	21
62	93
63	51
64	43
65	69
66	71
67	32
68	111
69	73
70	81
71	64
72	72
73	89
74	42
75	91