A347357 - cp's OEIS frontend

A347357 The numbers visited on a square spiral when starting at 1 and then stepping to the smallest unvisited number that is not visible from the current number.

n	a(n)
1	1
2	11
3	6
4	2
5	14
6	9
7	3
8	5
9	7
10	10
11	4
12	8
13	12
14	18
15	20
16	17
17	13
18	15
19	19
20	21
21	23
22	25
23	22
24	16
25	24
26	26
27	28
28	30
29	27
30	29
31	31
32	33
33	35
34	32
35	34
36	36
37	44
38	46
39	37
40	39
41	41
42	38
43	40
44	42
45	51
46	53
47	47
48	43
49	45
50	48
51	50
52	52
53	54
54	56
55	66
56	68
57	59
58	55
59	57
60	60
61	58
62	49
63	65
64	61
65	63
66	67
67	69
68	71
69	62
70	64
71	74
72	76
73	70
74	72
75	83
76	85
77	73

[1, 11, 6, 2, 14, 9, 3, 5, 7, 10, 4, 8, 12, 18, 20, 17, 13, 15, 19, 21, 23, 25, 22, 16, 24, 26, 28, 30, 27, 29, 31, 33, 35, 32, 34, 36, 44, 46, 37, 39, 41, 38, 40, 42, 51, 53, 47, 43, 45, 48, 50, 52, 54, 56, 66, 68, 59, 55, 57, 60, 58, 49, 65, 61, 63, 67, 69, 71, 62, 64, 74, 76, 70, 72, 83, 85, 73]

cp's OEIS Frontend

A347357 The numbers visited on a square spiral when starting at 1 and then stepping to the smallest unvisited number that is not visible from the current number.

Table of values

List of values

n	a(n)
1	1
2	11
3	6
4	2
5	14
6	9
7	3
8	5
9	7
10	10
11	4
12	8
13	12
14	18
15	20
16	17
17	13
18	15
19	19
20	21
21	23
22	25
23	22
24	16
25	24
26	26
27	28
28	30
29	27
30	29
31	31
32	33
33	35
34	32
35	34
36	36
37	44
38	46
39	37
40	39
41	41
42	38
43	40
44	42
45	51
46	53
47	47
48	43
49	45
50	48
51	50
52	52
53	54
54	56
55	66
56	68
57	59
58	55
59	57
60	60
61	58
62	49
63	65
64	61
65	63
66	67
67	69
68	71
69	62
70	64
71	74
72	76
73	70
74	72
75	83
76	85
77	73

n	a(n)
1	1
2	11
3	6
4	2
5	14
6	9
7	3
8	5
9	7
10	10
11	4
12	8
13	12
14	18
15	20
16	17
17	13
18	15
19	19
20	21
21	23
22	25
23	22
24	16
25	24
26	26
27	28
28	30
29	27
30	29
31	31
32	33
33	35
34	32
35	34
36	36
37	44
38	46
39	37
40	39
41	41
42	38
43	40
44	42
45	51
46	53
47	47
48	43
49	45
50	48
51	50
52	52
53	54
54	56
55	66
56	68
57	59
58	55
59	57
60	60
61	58
62	49
63	65
64	61
65	63
66	67
67	69
68	71
69	62
70	64
71	74
72	76
73	70
74	72
75	83
76	85
77	73

n	a(n)
1	1
2	11
3	6
4	2
5	14
6	9
7	3
8	5
9	7
10	10
11	4
12	8
13	12
14	18
15	20
16	17
17	13
18	15
19	19
20	21
21	23
22	25
23	22
24	16
25	24
26	26
27	28
28	30
29	27
30	29
31	31
32	33
33	35
34	32
35	34
36	36
37	44
38	46
39	37
40	39
41	41
42	38
43	40
44	42
45	51
46	53
47	47
48	43
49	45
50	48
51	50
52	52
53	54
54	56
55	66
56	68
57	59
58	55
59	57
60	60
61	58
62	49
63	65
64	61
65	63
66	67
67	69
68	71
69	62
70	64
71	74
72	76
73	70
74	72
75	83
76	85
77	73