A335585 - cp's OEIS frontend

A335585 The numbers visited on a square spiral, with a(n) = n for 1 <= n <= 3, when stepping to an unvisited number as close as possible to the n = 1 starting position that has at least one common factor with the second last visited number but none with the last visited number. In case of a tie, choose the smallest number.

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	6
11	25
12	12
13	35
14	16
15	7
16	10
17	21
18	20
19	27
20	22
21	39
22	11
23	18
24	77
25	24
26	49
27	34
28	63
29	17
30	28
31	51
32	40
33	33
34	46
35	45
36	23
37	30
38	161
39	26
40	69
41	13
42	36
43	65
44	32
45	55
46	38
47	75
48	19
49	42
50	95
51	44
52	85
53	48
54	115
55	52
56	105
57	62
58	87
59	68
60	29
61	54
62	203
63	60
64	119
65	76
66	153
67	70
68	117
69	50
70	57
71	56
72	81
73	58
74	93

[1, 2, 3, 4, 9, 8, 15, 14, 5, 6, 25, 12, 35, 16, 7, 10, 21, 20, 27, 22, 39, 11, 18, 77, 24, 49, 34, 63, 17, 28, 51, 40, 33, 46, 45, 23, 30, 161, 26, 69, 13, 36, 65, 32, 55, 38, 75, 19, 42, 95, 44, 85, 48, 115, 52, 105, 62, 87, 68, 29, 54, 203, 60, 119, 76, 153, 70, 117, 50, 57, 56, 81, 58, 93]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	6
11	25
12	12
13	35
14	16
15	7
16	10
17	21
18	20
19	27
20	22
21	39
22	11
23	18
24	77
25	24
26	49
27	34
28	63
29	17
30	28
31	51
32	40
33	33
34	46
35	45
36	23
37	30
38	161
39	26
40	69
41	13
42	36
43	65
44	32
45	55
46	38
47	75
48	19
49	42
50	95
51	44
52	85
53	48
54	115
55	52
56	105
57	62
58	87
59	68
60	29
61	54
62	203
63	60
64	119
65	76
66	153
67	70
68	117
69	50
70	57
71	56
72	81
73	58
74	93

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	6
11	25
12	12
13	35
14	16
15	7
16	10
17	21
18	20
19	27
20	22
21	39
22	11
23	18
24	77
25	24
26	49
27	34
28	63
29	17
30	28
31	51
32	40
33	33
34	46
35	45
36	23
37	30
38	161
39	26
40	69
41	13
42	36
43	65
44	32
45	55
46	38
47	75
48	19
49	42
50	95
51	44
52	85
53	48
54	115
55	52
56	105
57	62
58	87
59	68
60	29
61	54
62	203
63	60
64	119
65	76
66	153
67	70
68	117
69	50
70	57
71	56
72	81
73	58
74	93

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	6
11	25
12	12
13	35
14	16
15	7
16	10
17	21
18	20
19	27
20	22
21	39
22	11
23	18
24	77
25	24
26	49
27	34
28	63
29	17
30	28
31	51
32	40
33	33
34	46
35	45
36	23
37	30
38	161
39	26
40	69
41	13
42	36
43	65
44	32
45	55
46	38
47	75
48	19
49	42
50	95
51	44
52	85
53	48
54	115
55	52
56	105
57	62
58	87
59	68
60	29
61	54
62	203
63	60
64	119
65	76
66	153
67	70
68	117
69	50
70	57
71	56
72	81
73	58
74	93