A307838 - cp's OEIS frontend

A307838 Counterclockwise square spiral constructed by greedy algorithm such that the product of the values of any two vertically or horizontally adjacent cells is unique.

n	a(n)
0	1
1	1
2	2
3	3
4	3
5	4
6	2
7	5
8	7
9	2
10	11
11	8
12	3
13	9
14	5
15	10
16	2
17	13
18	7
19	16
20	3
21	17
22	5
23	8
24	18
25	3
26	19
27	4
28	13
29	11
30	5
31	14
32	7
33	12
34	8
35	23
36	1
37	29
38	5
39	15
40	8
41	22
42	5
43	23
44	4
45	18
46	17
47	6
48	26
49	5
50	27
51	6
52	25
53	9
54	11
55	19
56	1
57	31
58	9
59	17
60	11
61	20
62	7
63	21
64	8
65	37
66	3
67	41
68	11
69	24
70	9
71	35
72	6
73	34
74	10

[1, 1, 2, 3, 3, 4, 2, 5, 7, 2, 11, 8, 3, 9, 5, 10, 2, 13, 7, 16, 3, 17, 5, 8, 18, 3, 19, 4, 13, 11, 5, 14, 7, 12, 8, 23, 1, 29, 5, 15, 8, 22, 5, 23, 4, 18, 17, 6, 26, 5, 27, 6, 25, 9, 11, 19, 1, 31, 9, 17, 11, 20, 7, 21, 8, 37, 3, 41, 11, 24, 9, 35, 6, 34, 10]

cp's OEIS Frontend

A307838 Counterclockwise square spiral constructed by greedy algorithm such that the product of the values of any two vertically or horizontally adjacent cells is unique.

Table of values

List of values

n	a(n)
0	1
1	1
2	2
3	3
4	3
5	4
6	2
7	5
8	7
9	2
10	11
11	8
12	3
13	9
14	5
15	10
16	2
17	13
18	7
19	16
20	3
21	17
22	5
23	8
24	18
25	3
26	19
27	4
28	13
29	11
30	5
31	14
32	7
33	12
34	8
35	23
36	1
37	29
38	5
39	15
40	8
41	22
42	5
43	23
44	4
45	18
46	17
47	6
48	26
49	5
50	27
51	6
52	25
53	9
54	11
55	19
56	1
57	31
58	9
59	17
60	11
61	20
62	7
63	21
64	8
65	37
66	3
67	41
68	11
69	24
70	9
71	35
72	6
73	34
74	10

n	a(n)
0	1
1	1
2	2
3	3
4	3
5	4
6	2
7	5
8	7
9	2
10	11
11	8
12	3
13	9
14	5
15	10
16	2
17	13
18	7
19	16
20	3
21	17
22	5
23	8
24	18
25	3
26	19
27	4
28	13
29	11
30	5
31	14
32	7
33	12
34	8
35	23
36	1
37	29
38	5
39	15
40	8
41	22
42	5
43	23
44	4
45	18
46	17
47	6
48	26
49	5
50	27
51	6
52	25
53	9
54	11
55	19
56	1
57	31
58	9
59	17
60	11
61	20
62	7
63	21
64	8
65	37
66	3
67	41
68	11
69	24
70	9
71	35
72	6
73	34
74	10

n	a(n)
0	1
1	1
2	2
3	3
4	3
5	4
6	2
7	5
8	7
9	2
10	11
11	8
12	3
13	9
14	5
15	10
16	2
17	13
18	7
19	16
20	3
21	17
22	5
23	8
24	18
25	3
26	19
27	4
28	13
29	11
30	5
31	14
32	7
33	12
34	8
35	23
36	1
37	29
38	5
39	15
40	8
41	22
42	5
43	23
44	4
45	18
46	17
47	6
48	26
49	5
50	27
51	6
52	25
53	9
54	11
55	19
56	1
57	31
58	9
59	17
60	11
61	20
62	7
63	21
64	8
65	37
66	3
67	41
68	11
69	24
70	9
71	35
72	6
73	34
74	10