A355760 - cp's OEIS frontend

A355760 a(n) is the number of grid points in a square lattice covered by the area enclosed by n loops of an Archimedean spiral with starting point (0, 0) and endpoint (n, 0).

n	a(n)
0	1
1	2
2	8
3	21
4	40
5	64
6	97
7	132
8	178
9	228
10	282
11	350
12	415
13	492
14	574
15	660
16	756
17	855
18	962
19	1076
20	1195
21	1322
22	1451
23	1590
24	1736
25	1885
26	2044
27	2204
28	2378
29	2552
30	2734
31	2922
32	3116
33	3317
34	3525
35	3741
36	3960
37	4187
38	4416
39	4655
40	4900
41	5154
42	5410
43	5674
44	5946
45	6223
46	6502
47	6791
48	7087
49	7391
50	7698

[1, 2, 8, 21, 40, 64, 97, 132, 178, 228, 282, 350, 415, 492, 574, 660, 756, 855, 962, 1076, 1195, 1322, 1451, 1590, 1736, 1885, 2044, 2204, 2378, 2552, 2734, 2922, 3116, 3317, 3525, 3741, 3960, 4187, 4416, 4655, 4900, 5154, 5410, 5674, 5946, 6223, 6502, 6791, 7087, 7391, 7698]

cp's OEIS Frontend

A355760 a(n) is the number of grid points in a square lattice covered by the area enclosed by n loops of an Archimedean spiral with starting point (0, 0) and endpoint (n, 0).

Table of values

List of values