A265400 - cp's OEIS frontend

A265400 a(n) = one-based index to the nearest horizontally or vertically adjacent inner neighbor in square-grid spirals, or 0 if n is one of the corner cases A033638.

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

[0, 0, 0, 1, 0, 1, 0, 1, 2, 0, 2, 3, 0, 3, 4, 5, 0, 5, 6, 7, 0, 7, 8, 9, 10, 0, 10, 11, 12, 13, 0, 13, 14, 15, 16, 17, 0, 17, 18, 19, 20, 21, 0, 21, 22, 23, 24, 25, 26, 0, 26, 27, 28, 29, 30, 31, 0, 31, 32, 33, 34, 35, 36, 37, 0, 37, 38, 39, 40, 41, 42, 43, 0, 43, 44, 45, 46, 47, 48, 49, 50, 0, 50, 51, 52, 53, 54, 55, 56, 57, 0, 57, 58, 59, 60, 61, 62, 63, 64, 65, 0]

cp's OEIS Frontend

A265400 a(n) = one-based index to the nearest horizontally or vertically adjacent inner neighbor in square-grid spirals, or 0 if n is one of the corner cases A033638.

Table of values

List of values

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

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

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