A365344 - cp's OEIS frontend

A365344 a(0) = 0; for n > 0, a(n) is the largest distance squared on a square spiral between a(n-1) and any previous occurrence of a(n-1). If a(n-1) has not previously occurred then a(n) = 0.

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	41
48	61
49	0
50	74
51	0
52	58
53	0
54	50
55	0
56	61
57	50
58	5
59	0
60	58
61	32
62	0
63	85
64	0
65	113
66	0
67	89
68	0
69	73
70	0
71	89
72	16
73	53
74	0
75	85
76	68
77	0
78	89
79	61
80	65
81	0
82	145
83	0

[0, 0, 1, 0, 2, 0, 4, 0, 4, 4, 9, 0, 10, 0, 10, 4, 18, 0, 16, 0, 20, 0, 20, 4, 20, 16, 29, 0, 26, 0, 34, 0, 34, 4, 26, 20, 41, 0, 40, 0, 40, 4, 34, 72, 0, 45, 0, 41, 61, 0, 74, 0, 58, 0, 50, 0, 61, 50, 5, 0, 58, 32, 0, 85, 0, 113, 0, 89, 0, 73, 0, 89, 16, 53, 0, 85, 68, 0, 89, 61, 65, 0, 145, 0]

cp's OEIS Frontend

A365344 a(0) = 0; for n > 0, a(n) is the largest distance squared on a square spiral between a(n-1) and any previous occurrence of a(n-1). If a(n-1) has not previously occurred then a(n) = 0.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	41
48	61
49	0
50	74
51	0
52	58
53	0
54	50
55	0
56	61
57	50
58	5
59	0
60	58
61	32
62	0
63	85
64	0
65	113
66	0
67	89
68	0
69	73
70	0
71	89
72	16
73	53
74	0
75	85
76	68
77	0
78	89
79	61
80	65
81	0
82	145
83	0

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	41
48	61
49	0
50	74
51	0
52	58
53	0
54	50
55	0
56	61
57	50
58	5
59	0
60	58
61	32
62	0
63	85
64	0
65	113
66	0
67	89
68	0
69	73
70	0
71	89
72	16
73	53
74	0
75	85
76	68
77	0
78	89
79	61
80	65
81	0
82	145
83	0

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	41
48	61
49	0
50	74
51	0
52	58
53	0
54	50
55	0
56	61
57	50
58	5
59	0
60	58
61	32
62	0
63	85
64	0
65	113
66	0
67	89
68	0
69	73
70	0
71	89
72	16
73	53
74	0
75	85
76	68
77	0
78	89
79	61
80	65
81	0
82	145
83	0