A265409 - cp's OEIS frontend

A265409 a(n) = index to the nearest inner neighbor in Ulam-style square-spirals using zero-based indexing.

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

[0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 4, 4, 4, 5, 6, 6, 6, 7, 8, 9, 9, 9, 10, 11, 12, 12, 12, 13, 14, 15, 16, 16, 16, 17, 18, 19, 20, 20, 20, 21, 22, 23, 24, 25, 25, 25, 26, 27, 28, 29, 30, 30, 30, 31, 32, 33, 34, 35, 36, 36, 36, 37, 38, 39, 40, 41, 42, 42, 42, 43, 44, 45, 46, 47, 48, 49, 49, 49, 50]

cp's OEIS Frontend

A265409 a(n) = index to the nearest inner neighbor in Ulam-style square-spirals using zero-based indexing.

Table of values

List of values

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

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

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