A387220 - cp's OEIS frontend

A387220 Arithmetic mean of number of lattice points strictly inside circle of radius n centered on origin, and number of points not outside that circle.

n	a(n)
1	3
2	11
3	27
4	47
5	75
6	111
7	147
8	195
9	251
10	311
11	375
12	439
13	523
14	611
15	703
16	795
17	895
18	1007
19	1127
20	1251
21	1371
22	1515
23	1651
24	1791
25	1951
26	2115
27	2287
28	2451
29	2623
30	2815
31	2999
32	3207
33	3407
34	3619
35	3847
36	4051
37	4287
38	4511
39	4771
40	5019
41	5255
42	5523
43	5787
44	6075
45	6355
46	6623
47	6919
48	7211

[3, 11, 27, 47, 75, 111, 147, 195, 251, 311, 375, 439, 523, 611, 703, 795, 895, 1007, 1127, 1251, 1371, 1515, 1651, 1791, 1951, 2115, 2287, 2451, 2623, 2815, 2999, 3207, 3407, 3619, 3847, 4051, 4287, 4511, 4771, 5019, 5255, 5523, 5787, 6075, 6355, 6623, 6919, 7211]

cp's OEIS Frontend

A387220 Arithmetic mean of number of lattice points strictly inside circle of radius n centered on origin, and number of points not outside that circle.

Table of values

List of values