A253279 - cp's OEIS frontend

A253279 Arrange numbers in a clockwise spiral with initial terms a(1)=1, a(2)=2, a(4)=3, a(6)=4, a(8)=5; thereafter each number shares a factor with each of its four (N,S,E,W) neighbors.

n	a(n)
1	1
2	2
3	6
4	3
5	12
6	4
7	10
8	5
9	20
10	8
11	14
12	16
13	18
14	9
15	15
16	21
17	7
18	28
19	22
20	24
21	26
22	30
23	25
24	35
25	40
26	32
27	34
28	36
29	38
30	42
31	27
32	33
33	39
34	45
35	48
36	56
37	44
38	70
39	46
40	50
41	52
42	13
43	65
44	60
45	51
46	75
47	55
48	66
49	54
50	57
51	72
52	58
53	62
54	64
55	68
56	78
57	63
58	69
59	81
60	84
61	80
62	74
63	76
64	82
65	41

[1, 2, 6, 3, 12, 4, 10, 5, 20, 8, 14, 16, 18, 9, 15, 21, 7, 28, 22, 24, 26, 30, 25, 35, 40, 32, 34, 36, 38, 42, 27, 33, 39, 45, 48, 56, 44, 70, 46, 50, 52, 13, 65, 60, 51, 75, 55, 66, 54, 57, 72, 58, 62, 64, 68, 78, 63, 69, 81, 84, 80, 74, 76, 82, 41]

cp's OEIS Frontend

A253279 Arrange numbers in a clockwise spiral with initial terms a(1)=1, a(2)=2, a(4)=3, a(6)=4, a(8)=5; thereafter each number shares a factor with each of its four (N,S,E,W) neighbors.

Table of values

List of values

n	a(n)
1	1
2	2
3	6
4	3
5	12
6	4
7	10
8	5
9	20
10	8
11	14
12	16
13	18
14	9
15	15
16	21
17	7
18	28
19	22
20	24
21	26
22	30
23	25
24	35
25	40
26	32
27	34
28	36
29	38
30	42
31	27
32	33
33	39
34	45
35	48
36	56
37	44
38	70
39	46
40	50
41	52
42	13
43	65
44	60
45	51
46	75
47	55
48	66
49	54
50	57
51	72
52	58
53	62
54	64
55	68
56	78
57	63
58	69
59	81
60	84
61	80
62	74
63	76
64	82
65	41

n	a(n)
1	1
2	2
3	6
4	3
5	12
6	4
7	10
8	5
9	20
10	8
11	14
12	16
13	18
14	9
15	15
16	21
17	7
18	28
19	22
20	24
21	26
22	30
23	25
24	35
25	40
26	32
27	34
28	36
29	38
30	42
31	27
32	33
33	39
34	45
35	48
36	56
37	44
38	70
39	46
40	50
41	52
42	13
43	65
44	60
45	51
46	75
47	55
48	66
49	54
50	57
51	72
52	58
53	62
54	64
55	68
56	78
57	63
58	69
59	81
60	84
61	80
62	74
63	76
64	82
65	41

n	a(n)
1	1
2	2
3	6
4	3
5	12
6	4
7	10
8	5
9	20
10	8
11	14
12	16
13	18
14	9
15	15
16	21
17	7
18	28
19	22
20	24
21	26
22	30
23	25
24	35
25	40
26	32
27	34
28	36
29	38
30	42
31	27
32	33
33	39
34	45
35	48
36	56
37	44
38	70
39	46
40	50
41	52
42	13
43	65
44	60
45	51
46	75
47	55
48	66
49	54
50	57
51	72
52	58
53	62
54	64
55	68
56	78
57	63
58	69
59	81
60	84
61	80
62	74
63	76
64	82
65	41