A120701 - cp's OEIS frontend

A120701 Number of unit circles which fit touching a circle of radius n-1, i.e., with their centers on a circle of radius n.

n	a(n)
1	2
2	6
3	9
4	12
5	15
6	18
7	21
8	25
9	28
10	31
11	34
12	37
13	40
14	43
15	47
16	50
17	53
18	56
19	59
20	62
21	65
22	69
23	72
24	75
25	78
26	81
27	84
28	87
29	91
30	94
31	97
32	100
33	103
34	106
35	109
36	113
37	116
38	119
39	122
40	125
41	128
42	131
43	135
44	138
45	141
46	144
47	147
48	150
49	153
50	157
51	160
52	163
53	166
54	169
55	172
56	175
57	179
58	182
59	185
60	188

[2, 6, 9, 12, 15, 18, 21, 25, 28, 31, 34, 37, 40, 43, 47, 50, 53, 56, 59, 62, 65, 69, 72, 75, 78, 81, 84, 87, 91, 94, 97, 100, 103, 106, 109, 113, 116, 119, 122, 125, 128, 131, 135, 138, 141, 144, 147, 150, 153, 157, 160, 163, 166, 169, 172, 175, 179, 182, 185, 188]

cp's OEIS Frontend

A120701 Number of unit circles which fit touching a circle of radius n-1, i.e., with their centers on a circle of radius n.

Table of values

List of values

n	a(n)
1	2
2	6
3	9
4	12
5	15
6	18
7	21
8	25
9	28
10	31
11	34
12	37
13	40
14	43
15	47
16	50
17	53
18	56
19	59
20	62
21	65
22	69
23	72
24	75
25	78
26	81
27	84
28	87
29	91
30	94
31	97
32	100
33	103
34	106
35	109
36	113
37	116
38	119
39	122
40	125
41	128
42	131
43	135
44	138
45	141
46	144
47	147
48	150
49	153
50	157
51	160
52	163
53	166
54	169
55	172
56	175
57	179
58	182
59	185
60	188

n	a(n)
1	2
2	6
3	9
4	12
5	15
6	18
7	21
8	25
9	28
10	31
11	34
12	37
13	40
14	43
15	47
16	50
17	53
18	56
19	59
20	62
21	65
22	69
23	72
24	75
25	78
26	81
27	84
28	87
29	91
30	94
31	97
32	100
33	103
34	106
35	109
36	113
37	116
38	119
39	122
40	125
41	128
42	131
43	135
44	138
45	141
46	144
47	147
48	150
49	153
50	157
51	160
52	163
53	166
54	169
55	172
56	175
57	179
58	182
59	185
60	188

n	a(n)
1	2
2	6
3	9
4	12
5	15
6	18
7	21
8	25
9	28
10	31
11	34
12	37
13	40
14	43
15	47
16	50
17	53
18	56
19	59
20	62
21	65
22	69
23	72
24	75
25	78
26	81
27	84
28	87
29	91
30	94
31	97
32	100
33	103
34	106
35	109
36	113
37	116
38	119
39	122
40	125
41	128
42	131
43	135
44	138
45	141
46	144
47	147
48	150
49	153
50	157
51	160
52	163
53	166
54	169
55	172
56	175
57	179
58	182
59	185
60	188