A336799 - cp's OEIS frontend

A336799 The numbers visited on a square spiral, with a(1)=1, a(2)=2, a(3) = 6, 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 last visited number but none with the second last visited number. In case of a tie, choose the smallest number.

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	12
8	33
9	77
10	28
11	10
12	45
13	21
14	56
15	20
16	55
17	99
18	18
19	34
20	85
21	75
22	24
23	22
24	143
25	39
26	30
27	46
28	161
29	63
30	36
31	40
32	95
33	57
34	42
35	26
36	65
37	105
38	48
39	38
40	247
41	117
42	69
43	115
44	70
45	44
46	187
47	51
48	54
49	52
50	91
51	119
52	68
53	60
54	87
55	203
56	98
57	62
58	93
59	129
60	86
61	76
62	133
63	175
64	50
65	78
66	141
67	235
68	80
69	58
70	261

[1, 2, 6, 15, 35, 14, 12, 33, 77, 28, 10, 45, 21, 56, 20, 55, 99, 18, 34, 85, 75, 24, 22, 143, 39, 30, 46, 161, 63, 36, 40, 95, 57, 42, 26, 65, 105, 48, 38, 247, 117, 69, 115, 70, 44, 187, 51, 54, 52, 91, 119, 68, 60, 87, 203, 98, 62, 93, 129, 86, 76, 133, 175, 50, 78, 141, 235, 80, 58, 261]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	12
8	33
9	77
10	28
11	10
12	45
13	21
14	56
15	20
16	55
17	99
18	18
19	34
20	85
21	75
22	24
23	22
24	143
25	39
26	30
27	46
28	161
29	63
30	36
31	40
32	95
33	57
34	42
35	26
36	65
37	105
38	48
39	38
40	247
41	117
42	69
43	115
44	70
45	44
46	187
47	51
48	54
49	52
50	91
51	119
52	68
53	60
54	87
55	203
56	98
57	62
58	93
59	129
60	86
61	76
62	133
63	175
64	50
65	78
66	141
67	235
68	80
69	58
70	261

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	12
8	33
9	77
10	28
11	10
12	45
13	21
14	56
15	20
16	55
17	99
18	18
19	34
20	85
21	75
22	24
23	22
24	143
25	39
26	30
27	46
28	161
29	63
30	36
31	40
32	95
33	57
34	42
35	26
36	65
37	105
38	48
39	38
40	247
41	117
42	69
43	115
44	70
45	44
46	187
47	51
48	54
49	52
50	91
51	119
52	68
53	60
54	87
55	203
56	98
57	62
58	93
59	129
60	86
61	76
62	133
63	175
64	50
65	78
66	141
67	235
68	80
69	58
70	261

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	12
8	33
9	77
10	28
11	10
12	45
13	21
14	56
15	20
16	55
17	99
18	18
19	34
20	85
21	75
22	24
23	22
24	143
25	39
26	30
27	46
28	161
29	63
30	36
31	40
32	95
33	57
34	42
35	26
36	65
37	105
38	48
39	38
40	247
41	117
42	69
43	115
44	70
45	44
46	187
47	51
48	54
49	52
50	91
51	119
52	68
53	60
54	87
55	203
56	98
57	62
58	93
59	129
60	86
61	76
62	133
63	175
64	50
65	78
66	141
67	235
68	80
69	58
70	261