A345440 - cp's OEIS frontend

A345440 Represent the ring R = {x+ysqrt(-2): x, y rational integers} by the cells centered at the points (x,y) of a square grid, as in A345437; number the cells of the grid along a counterclockwise square spiral, with the cells at (0,0) and (1,0) numbered 0, 1; then a(n) is the norm x^2+2y^2 of the element of R occupying the n-th cell.

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

[0, 1, 3, 2, 3, 1, 3, 2, 3, 6, 4, 6, 12, 9, 8, 9, 12, 6, 4, 6, 12, 9, 8, 9, 12, 17, 11, 9, 11, 17, 27, 22, 19, 18, 19, 22, 27, 17, 11, 9, 11, 17, 27, 22, 19, 18, 19, 22, 27, 34, 24, 18, 16, 18, 24, 34, 48, 41, 36, 33, 32, 33, 36, 41, 48, 34, 24, 18, 16, 18, 24]

cp's OEIS Frontend

Table of values

List of values

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

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

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