A308081 - cp's OEIS frontend

A308081 Index positions of the points of a counterclockwise square spiral as described by A174344 and A274923 in a list of points with integer coordinates with primary sorting by radius and secondary sorting by polar angle as given by A305575 and A305576.

n	a(n)
1	0
2	1
3	5
4	2
5	6
6	3
7	7
8	4
9	8
10	20
11	9
12	13
13	21
14	14
15	10
16	15
17	22
18	16
19	11
20	17
21	23
22	18
23	12
24	19
25	24
26	44
27	36
28	25
29	29
30	37
31	57
32	38
33	30
34	26
35	31
36	39
37	58
38	40
39	32
40	27
41	33
42	41
43	59
44	42
45	34
46	28
47	35
48	43
49	60
50	80
51	68
52	56
53	45
54	49
55	61
56	70
57	97
58	71
59	62
60	50
61	46
62	51
63	63
64	73
65	98
66	74
67	64

[0, 1, 5, 2, 6, 3, 7, 4, 8, 20, 9, 13, 21, 14, 10, 15, 22, 16, 11, 17, 23, 18, 12, 19, 24, 44, 36, 25, 29, 37, 57, 38, 30, 26, 31, 39, 58, 40, 32, 27, 33, 41, 59, 42, 34, 28, 35, 43, 60, 80, 68, 56, 45, 49, 61, 70, 97, 71, 62, 50, 46, 51, 63, 73, 98, 74, 64]

cp's OEIS Frontend

A308081 Index positions of the points of a counterclockwise square spiral as described by A174344 and A274923 in a list of points with integer coordinates with primary sorting by radius and secondary sorting by polar angle as given by A305575 and A305576.

Table of values

List of values

n	a(n)
1	0
2	1
3	5
4	2
5	6
6	3
7	7
8	4
9	8
10	20
11	9
12	13
13	21
14	14
15	10
16	15
17	22
18	16
19	11
20	17
21	23
22	18
23	12
24	19
25	24
26	44
27	36
28	25
29	29
30	37
31	57
32	38
33	30
34	26
35	31
36	39
37	58
38	40
39	32
40	27
41	33
42	41
43	59
44	42
45	34
46	28
47	35
48	43
49	60
50	80
51	68
52	56
53	45
54	49
55	61
56	70
57	97
58	71
59	62
60	50
61	46
62	51
63	63
64	73
65	98
66	74
67	64

n	a(n)
1	0
2	1
3	5
4	2
5	6
6	3
7	7
8	4
9	8
10	20
11	9
12	13
13	21
14	14
15	10
16	15
17	22
18	16
19	11
20	17
21	23
22	18
23	12
24	19
25	24
26	44
27	36
28	25
29	29
30	37
31	57
32	38
33	30
34	26
35	31
36	39
37	58
38	40
39	32
40	27
41	33
42	41
43	59
44	42
45	34
46	28
47	35
48	43
49	60
50	80
51	68
52	56
53	45
54	49
55	61
56	70
57	97
58	71
59	62
60	50
61	46
62	51
63	63
64	73
65	98
66	74
67	64

n	a(n)
1	0
2	1
3	5
4	2
5	6
6	3
7	7
8	4
9	8
10	20
11	9
12	13
13	21
14	14
15	10
16	15
17	22
18	16
19	11
20	17
21	23
22	18
23	12
24	19
25	24
26	44
27	36
28	25
29	29
30	37
31	57
32	38
33	30
34	26
35	31
36	39
37	58
38	40
39	32
40	27
41	33
42	41
43	59
44	42
45	34
46	28
47	35
48	43
49	60
50	80
51	68
52	56
53	45
54	49
55	61
56	70
57	97
58	71
59	62
60	50
61	46
62	51
63	63
64	73
65	98
66	74
67	64