A307834 - cp's OEIS frontend

A307834 Counterclockwise square spiral constructed by greedy algorithm such that the sum of the values of any two vertically or horizontally adjacent cells is unique.

n	a(n)
0	0
1	0
2	1
3	2
4	2
5	5
6	1
7	8
8	10
9	1
10	12
11	13
12	2
13	15
14	17
15	18
16	3
17	20
18	19
19	25
20	2
21	27
22	22
23	21
24	32
25	2
26	35
27	26
28	28
29	38
30	4
31	43
32	31
33	31
34	32
35	48
36	4
37	52
38	37
39	39
40	34
41	58
42	6
43	63
44	40
45	46
46	49
47	39
48	70
49	5
50	76
51	42
52	56
53	51
54	45
55	80
56	5
57	86
58	44
59	62
60	66
61	67
62	46
63	96
64	5
65	100
66	50
67	71
68	72
69	76

[0, 0, 1, 2, 2, 5, 1, 8, 10, 1, 12, 13, 2, 15, 17, 18, 3, 20, 19, 25, 2, 27, 22, 21, 32, 2, 35, 26, 28, 38, 4, 43, 31, 31, 32, 48, 4, 52, 37, 39, 34, 58, 6, 63, 40, 46, 49, 39, 70, 5, 76, 42, 56, 51, 45, 80, 5, 86, 44, 62, 66, 67, 46, 96, 5, 100, 50, 71, 72, 76]

cp's OEIS Frontend

A307834 Counterclockwise square spiral constructed by greedy algorithm such that the sum of the values of any two vertically or horizontally adjacent cells is unique.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	2
4	2
5	5
6	1
7	8
8	10
9	1
10	12
11	13
12	2
13	15
14	17
15	18
16	3
17	20
18	19
19	25
20	2
21	27
22	22
23	21
24	32
25	2
26	35
27	26
28	28
29	38
30	4
31	43
32	31
33	31
34	32
35	48
36	4
37	52
38	37
39	39
40	34
41	58
42	6
43	63
44	40
45	46
46	49
47	39
48	70
49	5
50	76
51	42
52	56
53	51
54	45
55	80
56	5
57	86
58	44
59	62
60	66
61	67
62	46
63	96
64	5
65	100
66	50
67	71
68	72
69	76

n	a(n)
0	0
1	0
2	1
3	2
4	2
5	5
6	1
7	8
8	10
9	1
10	12
11	13
12	2
13	15
14	17
15	18
16	3
17	20
18	19
19	25
20	2
21	27
22	22
23	21
24	32
25	2
26	35
27	26
28	28
29	38
30	4
31	43
32	31
33	31
34	32
35	48
36	4
37	52
38	37
39	39
40	34
41	58
42	6
43	63
44	40
45	46
46	49
47	39
48	70
49	5
50	76
51	42
52	56
53	51
54	45
55	80
56	5
57	86
58	44
59	62
60	66
61	67
62	46
63	96
64	5
65	100
66	50
67	71
68	72
69	76

n	a(n)
0	0
1	0
2	1
3	2
4	2
5	5
6	1
7	8
8	10
9	1
10	12
11	13
12	2
13	15
14	17
15	18
16	3
17	20
18	19
19	25
20	2
21	27
22	22
23	21
24	32
25	2
26	35
27	26
28	28
29	38
30	4
31	43
32	31
33	31
34	32
35	48
36	4
37	52
38	37
39	39
40	34
41	58
42	6
43	63
44	40
45	46
46	49
47	39
48	70
49	5
50	76
51	42
52	56
53	51
54	45
55	80
56	5
57	86
58	44
59	62
60	66
61	67
62	46
63	96
64	5
65	100
66	50
67	71
68	72
69	76