A358048 - cp's OEIS frontend

A358048 Lexicographically earliest sequence of distinct nonnegative integers on a square spiral such that every number shares a digit with each of its eight surrounding neighbors.

n	a(n)
0	0
1	10
2	20
3	30
4	40
5	50
6	60
7	70
8	80
9	18
10	100
11	12
12	2
13	23
14	102
15	90
16	49
17	104
18	101
19	103
20	16
21	105
22	106
23	107
24	78
25	8
26	81
27	1
28	21
29	22
30	24
31	25
32	26
33	29
34	19
35	9
36	39
37	91
38	14
39	11
40	13
41	15
42	17
43	31
44	41
45	51
46	71
47	87
48	28
49	38
50	48
51	108
52	61
53	112
54	27
55	32
56	34
57	42
58	52
59	62
60	69
61	59
62	79
63	89
64	83
65	93
66	94
67	109
68	110
69	111
70	113

[0, 10, 20, 30, 40, 50, 60, 70, 80, 18, 100, 12, 2, 23, 102, 90, 49, 104, 101, 103, 16, 105, 106, 107, 78, 8, 81, 1, 21, 22, 24, 25, 26, 29, 19, 9, 39, 91, 14, 11, 13, 15, 17, 31, 41, 51, 71, 87, 28, 38, 48, 108, 61, 112, 27, 32, 34, 42, 52, 62, 69, 59, 79, 89, 83, 93, 94, 109, 110, 111, 113]

cp's OEIS Frontend

A358048 Lexicographically earliest sequence of distinct nonnegative integers on a square spiral such that every number shares a digit with each of its eight surrounding neighbors.

Table of values

List of values

n	a(n)
0	0
1	10
2	20
3	30
4	40
5	50
6	60
7	70
8	80
9	18
10	100
11	12
12	2
13	23
14	102
15	90
16	49
17	104
18	101
19	103
20	16
21	105
22	106
23	107
24	78
25	8
26	81
27	1
28	21
29	22
30	24
31	25
32	26
33	29
34	19
35	9
36	39
37	91
38	14
39	11
40	13
41	15
42	17
43	31
44	41
45	51
46	71
47	87
48	28
49	38
50	48
51	108
52	61
53	112
54	27
55	32
56	34
57	42
58	52
59	62
60	69
61	59
62	79
63	89
64	83
65	93
66	94
67	109
68	110
69	111
70	113

n	a(n)
0	0
1	10
2	20
3	30
4	40
5	50
6	60
7	70
8	80
9	18
10	100
11	12
12	2
13	23
14	102
15	90
16	49
17	104
18	101
19	103
20	16
21	105
22	106
23	107
24	78
25	8
26	81
27	1
28	21
29	22
30	24
31	25
32	26
33	29
34	19
35	9
36	39
37	91
38	14
39	11
40	13
41	15
42	17
43	31
44	41
45	51
46	71
47	87
48	28
49	38
50	48
51	108
52	61
53	112
54	27
55	32
56	34
57	42
58	52
59	62
60	69
61	59
62	79
63	89
64	83
65	93
66	94
67	109
68	110
69	111
70	113

n	a(n)
0	0
1	10
2	20
3	30
4	40
5	50
6	60
7	70
8	80
9	18
10	100
11	12
12	2
13	23
14	102
15	90
16	49
17	104
18	101
19	103
20	16
21	105
22	106
23	107
24	78
25	8
26	81
27	1
28	21
29	22
30	24
31	25
32	26
33	29
34	19
35	9
36	39
37	91
38	14
39	11
40	13
41	15
42	17
43	31
44	41
45	51
46	71
47	87
48	28
49	38
50	48
51	108
52	61
53	112
54	27
55	32
56	34
57	42
58	52
59	62
60	69
61	59
62	79
63	89
64	83
65	93
66	94
67	109
68	110
69	111
70	113