A355271 - cp's OEIS frontend

A355271 Lexicographically earliest sequence of positive integers on a square spiral such that the product of adjacent pairs of numbers within each row, column and diagonal is distinct in that row, column and diagonal.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	2
9	4
10	3
11	3
12	4
13	2
14	3
15	4
16	4
17	5
18	3
19	2
20	5
21	4
22	3
23	5
24	4
25	2
26	2
27	3
28	5
29	2
30	2
31	4
32	2
33	3
34	5
35	4
36	6
37	3
38	1
39	1
40	5
41	5
42	4
43	1
44	1
45	6
46	6
47	2
48	5
49	6
50	4
51	5
52	1
53	1
54	6
55	4
56	7
57	5
58	4
59	1
60	5
61	3
62	6
63	2
64	3
65	1
66	1
67	3
68	7
69	6
70	2
71	7
72	4
73	5
74	7
75	3
76	6
77	1
78	1
79	4
80	3
81	1
82	5
83	2
84	1
85	1
86	6
87	5
88	7
89	1
90	5
91	3
92	3
93	5
94	1
95	1
96	3
97	7
98	4
99	6

[1, 1, 1, 1, 2, 2, 3, 2, 4, 3, 3, 4, 2, 3, 4, 4, 5, 3, 2, 5, 4, 3, 5, 4, 2, 2, 3, 5, 2, 2, 4, 2, 3, 5, 4, 6, 3, 1, 1, 5, 5, 4, 1, 1, 6, 6, 2, 5, 6, 4, 5, 1, 1, 6, 4, 7, 5, 4, 1, 5, 3, 6, 2, 3, 1, 1, 3, 7, 6, 2, 7, 4, 5, 7, 3, 6, 1, 1, 4, 3, 1, 5, 2, 1, 1, 6, 5, 7, 1, 5, 3, 3, 5, 1, 1, 3, 7, 4, 6]

cp's OEIS Frontend

A355271 Lexicographically earliest sequence of positive integers on a square spiral such that the product of adjacent pairs of numbers within each row, column and diagonal is distinct in that row, column and diagonal.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	2
9	4
10	3
11	3
12	4
13	2
14	3
15	4
16	4
17	5
18	3
19	2
20	5
21	4
22	3
23	5
24	4
25	2
26	2
27	3
28	5
29	2
30	2
31	4
32	2
33	3
34	5
35	4
36	6
37	3
38	1
39	1
40	5
41	5
42	4
43	1
44	1
45	6
46	6
47	2
48	5
49	6
50	4
51	5
52	1
53	1
54	6
55	4
56	7
57	5
58	4
59	1
60	5
61	3
62	6
63	2
64	3
65	1
66	1
67	3
68	7
69	6
70	2
71	7
72	4
73	5
74	7
75	3
76	6
77	1
78	1
79	4
80	3
81	1
82	5
83	2
84	1
85	1
86	6
87	5
88	7
89	1
90	5
91	3
92	3
93	5
94	1
95	1
96	3
97	7
98	4
99	6

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	2
9	4
10	3
11	3
12	4
13	2
14	3
15	4
16	4
17	5
18	3
19	2
20	5
21	4
22	3
23	5
24	4
25	2
26	2
27	3
28	5
29	2
30	2
31	4
32	2
33	3
34	5
35	4
36	6
37	3
38	1
39	1
40	5
41	5
42	4
43	1
44	1
45	6
46	6
47	2
48	5
49	6
50	4
51	5
52	1
53	1
54	6
55	4
56	7
57	5
58	4
59	1
60	5
61	3
62	6
63	2
64	3
65	1
66	1
67	3
68	7
69	6
70	2
71	7
72	4
73	5
74	7
75	3
76	6
77	1
78	1
79	4
80	3
81	1
82	5
83	2
84	1
85	1
86	6
87	5
88	7
89	1
90	5
91	3
92	3
93	5
94	1
95	1
96	3
97	7
98	4
99	6

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	2
9	4
10	3
11	3
12	4
13	2
14	3
15	4
16	4
17	5
18	3
19	2
20	5
21	4
22	3
23	5
24	4
25	2
26	2
27	3
28	5
29	2
30	2
31	4
32	2
33	3
34	5
35	4
36	6
37	3
38	1
39	1
40	5
41	5
42	4
43	1
44	1
45	6
46	6
47	2
48	5
49	6
50	4
51	5
52	1
53	1
54	6
55	4
56	7
57	5
58	4
59	1
60	5
61	3
62	6
63	2
64	3
65	1
66	1
67	3
68	7
69	6
70	2
71	7
72	4
73	5
74	7
75	3
76	6
77	1
78	1
79	4
80	3
81	1
82	5
83	2
84	1
85	1
86	6
87	5
88	7
89	1
90	5
91	3
92	3
93	5
94	1
95	1
96	3
97	7
98	4
99	6