A274640 - cp's OEIS frontend

A274640 Counterclockwise square spiral constructed by greedy algorithm, so that each row, column, and diagonal contains distinct numbers.

n	a(n)
0	1
1	2
2	3
3	4
4	2
5	3
6	4
7	5
8	6
9	1
10	4
11	6
12	2
13	1
14	6
15	5
16	3
17	1
18	5
19	2
20	6
21	1
22	2
23	4
24	5
25	3
26	7
27	8
28	5
29	4
30	9
31	7
32	8
33	3
34	10
35	11
36	4
37	7
38	8
39	6
40	3
41	9
42	5
43	7
44	8
45	9
46	10
47	11
48	12
49	6
50	8
51	9
52	11
53	10
54	12
55	13
56	7
57	6
58	10
59	9
60	12
61	13
62	14
63	15
64	8
65	2
66	9
67	12
68	7
69	10
70	11
71	13
72	14
73	10
74	9
75	6
76	13
77	5
78	3
79	15
80	16
81	7
82	1
83	10
84	13
85	12
86	14
87	11
88	15
89	3
90	8
91	5
92	1
93	12
94	11
95	14
96	7
97	4
98	2
99	16
100	9
101	17
102	1
103	8
104	11

[1, 2, 3, 4, 2, 3, 4, 5, 6, 1, 4, 6, 2, 1, 6, 5, 3, 1, 5, 2, 6, 1, 2, 4, 5, 3, 7, 8, 5, 4, 9, 7, 8, 3, 10, 11, 4, 7, 8, 6, 3, 9, 5, 7, 8, 9, 10, 11, 12, 6, 8, 9, 11, 10, 12, 13, 7, 6, 10, 9, 12, 13, 14, 15, 8, 2, 9, 12, 7, 10, 11, 13, 14, 10, 9, 6, 13, 5, 3, 15, 16, 7, 1, 10, 13, 12, 14, 11, 15, 3, 8, 5, 1, 12, 11, 14, 7, 4, 2, 16, 9, 17, 1, 8, 11]

cp's OEIS Frontend

A274640 Counterclockwise square spiral constructed by greedy algorithm, so that each row, column, and diagonal contains distinct numbers.

Table of values

List of values

n	a(n)
0	1
1	2
2	3
3	4
4	2
5	3
6	4
7	5
8	6
9	1
10	4
11	6
12	2
13	1
14	6
15	5
16	3
17	1
18	5
19	2
20	6
21	1
22	2
23	4
24	5
25	3
26	7
27	8
28	5
29	4
30	9
31	7
32	8
33	3
34	10
35	11
36	4
37	7
38	8
39	6
40	3
41	9
42	5
43	7
44	8
45	9
46	10
47	11
48	12
49	6
50	8
51	9
52	11
53	10
54	12
55	13
56	7
57	6
58	10
59	9
60	12
61	13
62	14
63	15
64	8
65	2
66	9
67	12
68	7
69	10
70	11
71	13
72	14
73	10
74	9
75	6
76	13
77	5
78	3
79	15
80	16
81	7
82	1
83	10
84	13
85	12
86	14
87	11
88	15
89	3
90	8
91	5
92	1
93	12
94	11
95	14
96	7
97	4
98	2
99	16
100	9
101	17
102	1
103	8
104	11

n	a(n)
0	1
1	2
2	3
3	4
4	2
5	3
6	4
7	5
8	6
9	1
10	4
11	6
12	2
13	1
14	6
15	5
16	3
17	1
18	5
19	2
20	6
21	1
22	2
23	4
24	5
25	3
26	7
27	8
28	5
29	4
30	9
31	7
32	8
33	3
34	10
35	11
36	4
37	7
38	8
39	6
40	3
41	9
42	5
43	7
44	8
45	9
46	10
47	11
48	12
49	6
50	8
51	9
52	11
53	10
54	12
55	13
56	7
57	6
58	10
59	9
60	12
61	13
62	14
63	15
64	8
65	2
66	9
67	12
68	7
69	10
70	11
71	13
72	14
73	10
74	9
75	6
76	13
77	5
78	3
79	15
80	16
81	7
82	1
83	10
84	13
85	12
86	14
87	11
88	15
89	3
90	8
91	5
92	1
93	12
94	11
95	14
96	7
97	4
98	2
99	16
100	9
101	17
102	1
103	8
104	11

n	a(n)
0	1
1	2
2	3
3	4
4	2
5	3
6	4
7	5
8	6
9	1
10	4
11	6
12	2
13	1
14	6
15	5
16	3
17	1
18	5
19	2
20	6
21	1
22	2
23	4
24	5
25	3
26	7
27	8
28	5
29	4
30	9
31	7
32	8
33	3
34	10
35	11
36	4
37	7
38	8
39	6
40	3
41	9
42	5
43	7
44	8
45	9
46	10
47	11
48	12
49	6
50	8
51	9
52	11
53	10
54	12
55	13
56	7
57	6
58	10
59	9
60	12
61	13
62	14
63	15
64	8
65	2
66	9
67	12
68	7
69	10
70	11
71	13
72	14
73	10
74	9
75	6
76	13
77	5
78	3
79	15
80	16
81	7
82	1
83	10
84	13
85	12
86	14
87	11
88	15
89	3
90	8
91	5
92	1
93	12
94	11
95	14
96	7
97	4
98	2
99	16
100	9
101	17
102	1
103	8
104	11