A274641 - cp's OEIS frontend

A274641 Counterclockwise square spiral constructed by greedy algorithm, so that each row, column, and diagonal contains distinct numbers. Start with 0 (so in this version a(n) = A274640(n) - 1).

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

[0, 1, 2, 3, 1, 2, 3, 4, 5, 0, 3, 5, 1, 0, 5, 4, 2, 0, 4, 1, 5, 0, 1, 3, 4, 2, 6, 7, 4, 3, 8, 6, 7, 2, 9, 10, 3, 6, 7, 5, 2, 8, 4, 6, 7, 8, 9, 10, 11, 5, 7, 8, 10, 9, 11, 12, 6, 5, 9, 8, 11, 12, 13, 14, 7, 1, 8, 11, 6, 9, 10, 12, 13, 9, 8, 5, 12, 4, 2, 14, 15, 6, 0, 9, 12, 11, 13, 10, 14, 2, 7, 4, 0, 11, 10, 13, 6, 3, 1, 15, 8, 16, 0, 7, 10]

cp's OEIS Frontend

A274641 Counterclockwise square spiral constructed by greedy algorithm, so that each row, column, and diagonal contains distinct numbers. Start with 0 (so in this version a(n) = A274640(n) - 1).

Table of values

List of values

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

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

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